Many people say that when you flatten the sole of your woodworking plane that you should do so with the iron fitted. The idea being that if you remove the iron to flatten the plane, when you re-fit it the sole of the plane might be distorted by it.
What do you think?
In this video I take 3 different planes, flatten them to within a few ten thousandths of an inch with the irons out, re-fit the irons and re-check them for flatness.
Checkout the follow up video short here that directly measures the visible differences between the before and after blue patterns in ten thousandths of an inch. th-cam.com/users/shortsSgJ8aznef1w?feature=share
Handy Links
==========
Engineers Blue - amzn.to/3XoBMSM
Rubber Roller - ebay.us/RMBsyo
Surface Plate - ebay.us/2yrNIh