For the first few years that Singer produced the model 66 sewing machine, the machines had back clamping presser feet instead of the low shank side clamping feet used on their other machines. The back clamp feet are expensive and hard to find, and you are limited as to what feet and attachments are available,…
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Singer sewing machine
Singer sewing machine
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Helen Howes Sewing Machines - Converting a Back-clamping Singer 66 to use Side-clamping Feet