On these shocks does the eye on the end of the shaft unscrew?
I made this shock compressor from a piece of Unistrut, small piece of 2x2 angle (slotted for the shaft to pass thru), a handle bent from a length of 1x3/16 strap. Attach the angle to the Unistrut using a unistrut nut so you can slide it anywhere in the channel, then tighten it down. I've used this by hand up to 800 pound springs. The ratchet strap is only used to hold the spring squeezed so you can start the eye on the end of the shaft.