I bought a used bike to repair and resell and noticed, that the frame had a crack. I decided to build up a rigid mountain bike for myself and repair the frame.
The bike was a Pinarello Treviso Mountainbike, a very rare bike from 1990 or 1991. Aluminium frames were pretty rare at that time, however the weight of the frame is only 1.6 kg. Quite obvious that it broke.
If you look at the dropout, you notice, that it is welded the rear tube, which got squashed. An obvious design flaw. Since I can't weld aluminum, and always wanted to repair a cracked frame with fiberglass and resin, I repaired the frame this way: