I have the same tool and used it a couple of times. Remove the shocks and insert the tool. Make sure the lower plate is down as far as possible and the upper is up as far as possible. Makes your life easier. I compress the spring and always remove it from the tower. Lay it down slowly and release the tension. I never worked on the UCA while the spring is in the tower. I trust the tool, but why taking any risk, so fast to remove the coil.
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1966 Convertible (Plant: San Jose, CA)
289 2V, PS, AC