Hello,
I've noticed a few times that some people are recommending higher subclass, regarding bobbin size and specifications, but this is not the best advice, they have different variations in all eg, 29k70 is infact a small bobbin plus other variables, the 29k71 is a large bobbin with other variables,
The best most reliable information can be found on the "ismacc" website for nearly all out of production sewing machine world manufacturer and models,
P,S "ismacc" might not be exactly spelt correct but looking for sewing machine information of older kinds should bring up the site with info from a site named very similar, thanks
