Knitting Machine skills: How to cast on with a Knitmaster 4500 and Ribmaster

This video will show you some of the pitfalls to avoid with the Knitmaster 4500 and Ribmaster (also called a Knittax and a KnitKing in different markets).
This machine is for sale as it happens; check it out at www.vintageKM.co.uk

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Why British made knitting 4500 has brush on cam vs German made knitted M2 does not. Thank you