Bought to get some coil springs off a 455 with a 2nd gen AC Trans Am which is probably one of the most durable springs made by GM are used. It helped get the feathers out but some tips and warnings for others. Disassemble the compressor, install the upper and lower jaws, then tighten the jackbolt from bottom to top. If you look at the space you need to get the claws on the spools, only 3-4 spools are visible to secure them. Upper and lower spring pockets block access to further open clamps. I tried to get it as high on the spool as possible and tried to roll it further into the spring's pocket, but the puller arms got into that pocket. I was only able to compress the spring about 2-1/2 inches, which this compressor did with ease, and that was enough to pull the spring out with a pry bar without much effort. Be careful, compressed springs can be deadly.
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