Thanks Rob! Just finished an *** losing house, but started a 2nd story vinyl job. Ugh..but its for an elderly widow... really Alot of her wood needs RnR. T-1-11. Been replaced twice. Total garbage. I found an old dizzy I had w/ 2 light springs.. but the slots appear about the same as the dizzy w/ too much advance. I started to take it apart to actually measure the slots, thing has issues... I think I got it from my Friend ( that just got diagnosed w/ prostate cancer) he has a 71 340 4 spd Cuda. But he coulda bought it at Garlits as a spare. Do you think I should get Don's spring kit too? Or the book he has, so I can quit bothering Y'all?