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Are you refering to the weights on the bar ends? If so the center bolt threads into the bar ends. Often times, when a bike takes a fall, the bolt holding the ends on becomes bent, if it strips when trying to remove it the next step is to cut it off, leave enough of the bolt to be able to grab it with a pair of plyers after being cut.
the metal stops are welded in place.
the motorbike is a cafe racer,iam wanting to fit retro mirrirs in the end of the bars.