[s-cars] Rear caliper rebuild question

[D Landaeta]

I decided to finally fix my sticking parking brake and properly rebuild the
rear calipers. It may be just the beginning of a slippery slope as I see
that most of the rubber bits under there are fairly shot. So subframe
bushings and new control arms (if I can find non-chinese junk).. I
digress... So I looked at the various great write-ups and have the caliper
set up for getting the piston interior circlip out. My question is how much
pressure does it take to push that spring down in order to somehow get a
pair of circlip pliers or the like in there and remove the circlip? I used
a metal bar with a bolt setup through it and an old socket. It seemed like
a lot of pressure and I was getting no movement from the inner spring. At
the risk of breaking something, I thought I'd ask y'all for some advice.

Doug enjoying UrS4 time in the 70+ degrees of partly sunshine this weekend
in TN