The hardest part of fixing up a car with very little support is the odd model-specific OEM part.  The Glas GT has just such a part in its clutch slave cylinder, an Ate item. My car came with one -a bit of good luck if you will, but it was VERY frozen and just generally not an encouraging prospect for clutching. Jaan was confident it would come apart and sure enough, it did.
The thing about hydraulic pressure is, it doesn’t really take no for an answer, so long as the question has enough pressure to force the recalcitrant part to answer. In this case I cleaned it, we applied serious cutting-torch type heat, and then we hooked it up to a 2 ton bottle jack. We let it sit at about 100 PSI over night and the next morning, a little pump on the jack saw the cylinder pop out.
