So i was trying to replace the arms on my v brakes and i ran into an odd snag. The thread that the pivot bolt screws into on the bike is actually also a bolt with threads on its inside and out by the looks of it.
This was news for me, but the problem is they are inseparably fused together on the one side somehow, try as i may. Does anyone know what this bolt is called or where to get a replacement so i can put on my new brake arm?


Thanks from a newbie bicyclist.