After you remove the crane with cylinder from the frame, then you can dissasemble the crane/cylinder as follows:
1. Pad (leather) the knurled end of the extractor rod and grip it in a vise (or with vice-grip pliers if you must).
2. Grab the cylinder with your hand and turn clockwise (if I recall correctly) to unscrew the ejector rod.
3. Pay attention as it comes apart and lay out the parts in order so you can get it all back together.
I've done this to add end-shake bearings and it's rather straightforward. However if attmept this, the risk is 100% yours not mine.