1993 960 driver window not sensing when down
I'm trying to figure out a problem with my dads 1993 960 drivers window. it goes up & down, no problem BUT, when going down, as it reaches the very bottom, it makes a loud bang. Upon removing the door panel & investigating, it appeared it was the window regulator, and the teeth looked stripped. I put a couple pieces of 2x4's under it, so it wouldnt go down as far & that temporarily fixed it. Well it started happening again and after looking at it & reading a few threads on here it seems that the window is not 'sensing' when it reaches the bottom and is forcing the regulator, causing the teeth to jump. I cannot find any definitive answers on here, just that there is a 'current sense circuit' that is involved. I dont have a manual, but know a fair bit about electronics & mechanics. I just need someone to point me in the right direction. Any help or advice would be appreciate.