When rehairing bows, sometimes you run across a frog where someone has drilled a hole so they can use a pin. Unfortunatally they also drill a hole into the mortice so the hair will fit usng the pin. Ugh, with that modification you can not put a block in. For a quick fix, I clean up the hole, use a hard filler and reshape the edeg of the mortice. That way I can use a regular block again.
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