Mike, I've gotten a number of them apart that were pretty seized. Just takes a little effort. Squirt a liberal amount of penetrating oil in each orifice and let sit for awhile. The first piston is easy to get out as you can drill a hole in it and thread it, then use a bolt to pull it out, after you remove the retaining ring. You can use a socket extension and a socket that matches the piston head to "bounce" the rear piston free. (note: try this first with the accessible piston as this helps to loosen it. Sometimes the pistons will stick in farther, but they have springs behind them, so there's tension there. A long needle nose pliers helps to grab hold of the second piston's nub. It's just a matter of trial and error. I haven't had one beat me yet.
I've had success with Apple. M.C.s are easy to rebuild so I just had them put the brass sleeve in. That's $115.
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