Alright, I'll step back and recap the steps so far.
I removed the two hydraulic fittings from the body assembly (case). I placed the case in my small pipe vise cushioned with rubber gasket material. I applied a liberal amount of PB Blaster in the slot, or window that exposes the case head retaining wire. Using a pin spanner wrench, I turned the head until the ends of the wire were exposed in the window, With one end at maximum exposure, I lifted it up with an L pick and grabbed it with a needle-nose pliers. I continued to turn the head while pulling the wire outside the case until it was removed. I twisted the head back and forth until it loosened sufficiently to allow removal by hand. Leverage was applied by slowly pulling on the rod until the piston forced the case head off. I removed the piston o-ring with a small hook-tip pick.
Now for the visual effects! I tightly clamped the piston in a vice, cushioned by cork flooring scraps. (note that any vice work requires oil-free parts and grippy cushion material - a slip may result in marriing, even in a smooth-jaw) I used a MAPP torch to quickly heat the piston/rod threads. Only loctite can hold like this sucker was being held! I put a large screwdriver through the rod eye, and turned the rod out.
While they were cooling, I attacked the two case head seals. The inner o-ring was removed with a small combination-tip pick. The outer seal was compromised. it was hard, and melted into the seat. The seat has a knurled lip that is thin, so care must be taken when removing this seal. The seat and seal are terraced, and the lip holds the seal in place. Mine came out in pieces, and I wound up smoking the remaining rubber with the MAPP torch and brushing the rest out.
That's as far as I got because I had to make bison and scallop kabobs for the annual work picnic. Tomorrow I will clean and recondition surfaces and complete the reassembly with the new rings and seals.
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