This is for my 1940s Benjamin 317 specifically, but the exact same technique is used for any leather air gun seal. Easy to do and only basic hand tools are needed for this repair.
I can't verify if its right but I've been told that they originally boiled the leather in oil before pressing it into the seal mould to make them in the factory. Great idea for reproduction method though.
@@inrangerimfire20two Hi Dan. Just letting you know I made a new cup and it works great! Dont have to pump as many times to get proper pressure for lighting the stove. I had to file down sides of a cheap 1 inch wood auger spade to get proper diameter and used a piece of scrap hardwood block instead of soft wood. This gave a clean cut without having to sand the interior of the wood. Got some leather from an arts and craft store (Michaels actually) that matched the width of original nicely, soaked the leather square I cut in hot water for 30 minutes and pressed into wood with a vice using a 5/8ths socket which allowed for thickness of the leather. I pressed the smooth finished side of vegetable tanned leather into the hole so there was no need to sand the cup afterwards. I also trimmed the leather while the socket was still stuck in the wood with an exacto knife then removed the socket and dried out the leather (while jn the wood) with a hair dryer. I didnt have a punch to make needed hole in the cup for pump shaft so I used a 3/8ths drill which also removed the new cup without splitting the wood. I should be able to make a few more spare cups with same mold. Sorry for long winded explanation but thought you and others might be interested in this method. After seeing other over engineered methods in you tube, your method was most practical and useful approach. Thanks again as now i may dig out my old Slavia 620 and see if it needs a cup! I am assuming that springers have a cup to push air into the barrel when the trigger releases the compressed spring.
@@marksmith9295 HA! Well done sir!! I’m glad it worked so well for you. The 620 is a great Airgun and I have a video where I talk about it’s siblings the Slavia 618/624. th-cam.com/video/ysuHzwm6JVw/w-d-xo.html
Great video! I have to replace my BSF Media .22 leather piston seal so your video was an amazing find! Thank you. I also want to mention your pocket knife. It looks like a Barlow. I love pocket knives as well. 🙂
Thanks a lot for the kind words, I appreciate it! Glad to hear you got your BSF working again too. The knife is 1950s Kutmaster in a Barlow pattern. Good eye..
Lovely stuff was looking for a leather seal for my dads old taylor pari fin old cooker and the dont make them any more gona give this a crack much love fae bonnie Scotland cheers
I enjoy this. I need to do this but the piston of the Diana model 22 (1938) I want to get up and running doesn't have a screw, rather it's riveted. So perhaps I can put a double layer of leather on then boil it in situ so it shrinks to fit? 🤔
The riveted pistons have some challenges for sure, I normally drill and tap and then use a screw to reinstall a new leather washer, but if you do not have that capability, you can usually just remove the old seal and reinstall a leather new one with a washer and hammer it to fit.
No, that would only be a risk where the oil would be combustible- like in a spring piston air rifle where you would experience a “dieseling effect”. In a pneumatic air rifle the air is compressed and then released from a chamber.
![เปิดใจ พี่ญา คนรุม หลังทัวร์ลง หนักสุดในชีวิต!! l [Nickynachat]](http://i.ytimg.com/vi/2-OJZRtclro/mqdefault.jpg)
I can't verify if its right but I've been told that they originally boiled the leather in oil before pressing it into the seal mould to make them in the factory. Great idea for reproduction method though.
Nice job, thank you for sharing your skill & knowledge.
Thanks for the comment!
Great idea! Will use to make a leather pump cup that is no longer available for my vintage 1938 coleman stove. Thanks for sharing.
Well, thank you for the kind words.
The same technique would absolutely work for the stove cup seal. Let me know how it goes!
-Dan
@@inrangerimfire20two Will do Dan!
@@inrangerimfire20two Hi Dan. Just letting you know I made a new cup and it works great! Dont have to pump as many times to get proper pressure for lighting the stove. I had to file down sides of a cheap 1 inch wood auger spade to get proper diameter and used a piece of scrap hardwood block instead of soft wood. This gave a clean cut without having to sand the interior of the wood. Got some leather from an arts and craft store (Michaels actually) that matched the width of original nicely, soaked the leather square I cut in hot water for 30 minutes and pressed into wood with a vice using a 5/8ths socket which allowed for thickness of the leather. I pressed the smooth finished side of vegetable tanned leather into the hole so there was no need to sand the cup afterwards. I also trimmed the leather while the socket was still stuck in the wood with an exacto knife then removed the socket and dried out the leather (while jn the wood) with a hair dryer. I didnt have a punch to make needed hole in the cup for pump shaft so I used a 3/8ths drill which also removed the new cup without splitting the wood. I should be able to make a few more spare cups with same mold.
Sorry for long winded explanation but thought you and others might be interested in this method.
After seeing other over engineered methods in you tube, your method was most practical and useful approach. Thanks again as now i may dig out my old Slavia 620 and see if it needs a cup! I am assuming that springers have a cup to push air into the barrel when the trigger releases the compressed spring.
@@marksmith9295 HA! Well done sir!! I’m glad it worked so well for you. The 620 is a great Airgun and I have a video where I talk about it’s siblings the Slavia 618/624.
th-cam.com/video/ysuHzwm6JVw/w-d-xo.html
Great video! I have to replace my BSF Media .22 leather piston seal so your video was an amazing find! Thank you. I also want to mention your pocket knife. It looks like a Barlow. I love pocket knives as well. 🙂
Thanks a lot for the kind words, I appreciate it!
Glad to hear you got your BSF working again too.
The knife is 1950s Kutmaster in a Barlow pattern. Good eye..
Oh interesting! That would definitely work and would cut down on the time the seal would take to dry from being wet
Great commentary. You know your stuff.
Great video,thank you Sir.Greetings from Croatia.
Thank you very much! Happy new year to you
Lovely stuff was looking for a leather seal for my dads old taylor pari fin old cooker and the dont make them any more gona give this a crack much love fae bonnie Scotland cheers
Cheers and good luck!
Stop back and let me know how you faired with it.
-Dan
I enjoy this. I need to do this but the piston of the Diana model 22 (1938) I want to get up and running doesn't have a screw, rather it's riveted. So perhaps I can put a double layer of leather on then boil it in situ so it shrinks to fit? 🤔
The riveted pistons have some challenges for sure, I normally drill and tap and then use a screw to reinstall a new leather washer, but if you do not have that capability, you can usually just remove the old seal and reinstall a leather new one with a washer and hammer it to fit.
What type of leather being used and is treated or what
I’m not sure as I bought from a thrift store
bel video e ottime spiegazioni, ma l'olio idraulico poi non fa fumo quando si spara?
No, that would only be a risk where the oil would be combustible- like in a spring piston air rifle where you would experience a “dieseling effect”. In a pneumatic air rifle the air is compressed and then released from a chamber.
Any update on this video ⁉️ Would like to know how the repair turned out❗😁
The repair worked fine and the airgun has been back in action ever since
Same problem for me