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Old 11-28-19, 10:19 PM
Bill Kapaun
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Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

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I surmise the OP has a claw type RDER and stripped out the attaching screw, which is likely 5mm.
And then drilled the hole way too much oversize? Should have started at 6mm?

Not sure if "claw" will handle having the hole enlarged to 8mm?
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