back up light question

I had a similar problem with mine. There's a sort of cam shaped piece on the reverse lever internal to the trans that is what contacts the ball in the switch. On mine, if I kept pressure on the lever while in reverse it would just barely keep the lights on, but if you put it in reverse and take your hand off it would cut the lights. Unfortunately, there was no real adjustment on the trans interally, and tweaking the linkage didn't seem to help me much. Your mileage may vary with adjusting it. The only other idea I could think of would be putting some weld or epoxy on the cam inside the trans to build it up a little bit so it engages the ball further into the switch.