Hey, I want to hear more about the spring compressor too. When I was a 16 year old kid, I rebuilt the front end of a '62 chevy using a homemade spring compressor. It consisted of 7 inch long, 1 inch wide, 3/4" thick steel bars on each end with a hole for a 5/8" inch threaded rod. The first time I used it, it started compressing the springs then, bang, the steel bars unwound following the curvature of the springs. It looked like a propeller in a hurricane. I rigged up a clamp to make them stay put but I swore I would never do this again. I had no idea how dangerous it was until a couple years later when I heard that someone was killed when a coil spring under compression let loose and hit him in the head.

Sorry about the confusion on the collar remover. It wasn't a 1/2" socket it was a 1" or 1-1/8" socket that had a 1/2" drive. The external diameter of the collar is 1.265+/- 0.001". The internal diameter is 0.983 +/- 0.001". I used a socket with the same external diameter and cut the ears which are 0.362 +.005/-0.002" wide. Once I had the flat ears cut, I bevelled them with a hand file until they followed the contour of the slot in the prechamber (It's not flat, it's at an angle).
I will send pictures when I find the tools, my car is spread all over the garage and I can't find the collar remover.