shoemaker4 Report post Posted October 16, 2023 Does anybody know the thread size/tap for a Presser Foot Regulating Thumb Screw commonly found on Industrials, say the 31-15? I have an old junk machine that was basically used as a hole puncher and am drilling/tapping a few holes to make it a complete sewing machine. typically the screw holes themselves look to be 1/2 in diameter but I’m not having any luck finding the thread size/tap neither Metric nor Imperial. Quote Share this post Link to post Share on other sites
kgg Report post Posted October 16, 2023 28 minutes ago, shoemaker4 said: Does anybody know the thread size/tap for a Presser Foot Regulating Thumb Screw commonly found on Industrials, say the 31-15? If it is a Singer don't be surprised at not finding a tap as Singer and some Juki's had their own specific custom thread. kgg Quote Share this post Link to post Share on other sites
CowboyBob Report post Posted October 16, 2023 It is a 1/2" x28 tpi.I made a tap once out of an old one (screw)by cutting 4 slots in the bottom up a 1/2" or so & squeezed it in alittle so it would start. Quote Share this post Link to post Share on other sites
shoepatcher Report post Posted October 17, 2023 taps are cheap on google. Found one for $9.95 plus shipping glenn Quote Share this post Link to post Share on other sites
shoemaker4 Report post Posted October 18, 2023 Thanks guys. Quote Share this post Link to post Share on other sites
