Have a stuck ring on a 77 R100. Its the top one. There is so little of a gap I can barely get my smallest screwdriver in the gap. Its a very small one that I am sure the end will snap off with much pressure. So I sprayed with Liquid Wrench and let sit overnight. Still no budging. I tried to catch the end edge with a screw driver but dont want to booger up any edges on the piston. I am going to try dropping it in some boiling water next. Anyone have any other tricks that dont involve me whacking the crap out of it. I could use some heat but hate the chance that I might put too much to it and warp the piston. Thanks in advance for any tricks.