I am restoring to working order, my wife's great aunt's New Home Treadle Sewing Machine. It is missing the spring loaded part that locks the handwheel to the belt pully. I can use a small bolt to lock these two together, but when would one wish to uncouple the handwheel from the belt pulley?
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I believe it would be best to replace the spring as most of the time, vintage machines did not have 'unnecessary' pieces/parts.
If working on sewing machines is a new hobby for you it may be a good idea for you to join one of the sewing machine groups that have a lot of knowledgeable sewing machine people that can help you with any problems you may have now or in the future.
These members can help you find parts or make a part if none are available as they are usually in contact with other sites that help you if they cannot.
groups.io/
Thank you. My guess on why one might want to decouple the drive wheel from the machine would be to thread the bobbin without the needle going up and down.
for clarity, the belt groove is actually part of the handwheel casting. It is the round part right next to it closest to the machine that can turn independently if not coupled to the handwheel
I would think a sewing machine parts store or repair shop could help you get your missing part.
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