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need help fixing back gear ring

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could any tell me how to remove the hi/low speed ring with the pins on a bridgeport j head clone?

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the threaded holes for the pins are stripped

right now there are 3/8" bolts in the holes

what is the best way to repair it?

can i just remove the ring and drill and tap new holes in fresh material
or do i have to fill in the existing holes with weld and redial and tap

thanks in advance for your helpClick image for larger version. 

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