Use a center punch for marking a dimple to drill, put a dent around the bushing hole about 0.5-1mm away from the edge of the hole, enough to spread the edge of the hole inwards a little bit. That will hold the bushing tighter. Dont' bother attempting to put larger bushings in a V2 mechbox, chances are high, even if off by a couple hair's bredth distance, you'll off center a gear or two and destroy your mechbox fast.
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