I have a Nelco sam3b-3 machine. When the reverse button is pushed in, it will sew in reverse. However when released, the machine will not return to forward sewing. I can manually fix the problem inside the machine to make it return to forward sewing.
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This site seems to have the manual for these machines: www.sewingmanuals.com/
You probably have a broken gear or lever. Old machines have metal parts, not plastic and are generally worth fixing.
Machines often stick in reverse when they have been stored for long periods, it is caused by the lubricants becoming "gummy" or looked varnish. Before you spend money on a repair try this simple remedy, open the top (usually two screws) and warm the gears worth a hair dryer, this will frequently free it up.
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