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Old 01-11-19, 05:55 AM
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Join Date: Nov 2013
Location: Near Pottstown, PA: 30 NW of Philadelphia
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Bikes: 2 Trek Mtn, Cannondale R600 road, 6 vintage road bikes

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As this is a 'light duty' application, I wonder if you can rig a stud so you can ride it while searching for the correct parts. Find the correct metric screw (3 or 4 mm?) as long as the proper grub screw. Screw it into place and cut to length. Maybe reinforce at the cover broken section with a zip tie. In normal use this grub screw is not in play. Only when you fully slack the chain during wheel removal or RD removal. Just take it real easy when you do this to prevent tiny damage to the RD lower body. You could even cover the exposed threads with plastic tubing or heat shrink.

Maybe you could run the temp screw in from the back side so you don't have to cut the head off. I've not looked to see if that cover is threaded right through. I'll bet it though - easier to manufacture.
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