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Please keep in mind the differences in spindle register diameters between the Atlas and South Bend lathes. While they're both are threaded 1 1/2-8, the spindle register diameter on South Bends is 1.51

I have the same arrangement my 12" Craftsman 101.07403 standard change gear lathe. My compound handle got broken for reasons I'd rather not discuss right now. This feed screw now has the larger cross

Put the feed gear's tumbler reverse in the neutral position. That will disconnect the gearing from the spindle. If your lathe has the lead screw reverser, loosen the banjo clamp bolt and drop the gear

These holes line up with the spindle back gears. I wonder if the intention was they could be used with a suitable detent pin for indexing holes not provided for by the 60 holes in the bull gear?