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It's not exactly about customizing, but I figure this may be worth asking here. I imagine you have to deal with stuff like this sometimes.
If you had to fill gaps in between two parts in order to (hopefully permanently) remove any wobble or other movement of the parts, what kind of material would you use? It doesn't have to be something adhesive per se, the parts are held in place, just something that holds its shape and is solid enough to kill any wiggle room.
