I have a 1924 SB that has a missing tooth on the forward/backward carriage feed lever. My lathe may be older style than yours, it has a whole mess of different gears in a separate box and I change them around manually according to the chart on the cover. Anyway, I was getting something done at the local waterjet shop, and mentioned this broken gear to him. He said he has software to waterjet cut straight gears, given all the measurements.. Might be worth seeking your local waterjet shop out. I'm sold on his work, the tolerances the waterjet keeps are pretty amazing.
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