I have built a much sturdier device to pull out the damper rod when the spring is off. All my bits of kit for taking dampers apart are built around a similar principle (and spacing) so that I can re-use bits & pieces.
G
DJM wrote:If you've built a compressor something like Graham's it wouldn't take much to incorporate a second (fixed ) plate at the top to engage with the top eye and stop it moving down with the shroud and springs.
Yours can only be stuck somehow, (can't begin to guess what with) but a simple modification to your jig would mean that they HAVE to separate as the spring is compressed.
Just a point, are both of your shocks the same or have you only tried splitting one of them so far?