Originally Posted By: HomelessjOe
I mentioned this in another post way way back.

What made me think this was a possible cause was looking at alot of SxS's that the ribs were letting go on the front and rear ends...likely places for Solvent exposure.

It is also the spots were the shot meets resistence in the form of forcing cone and choke it must set up a pretty nasty vibration when a shot charge hits either