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Those look to be M5 set screws -- 0.96" is a little under 2.5mm -- and a 2.5mm allen key should fit an M5 -- snapping a measurement from the photo you posted seems to agree. I'm not sure why the set screws would have changed from 1/4-20 to M5 -- Although -- I looked up your order from 2017 to get the part number. There is a note on that part that suggests that back in 2012 we had 1/2 pinions bored out to 14mm by our supplier to fit the motors we were using. Since then, it looks like we are purchasing a pinion that comes standard with 14mm bore -- which would likely mean metric set screws. M5 is a fine-thread screw and should be able to take about 5 ftlb of torque vs about 9ftlb for a 1/4-20.
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