all you need to know re. care and maint on the converter/clutch is here
http://www.*****************/asymapp.htm
be careful using an impact on the shaft bolts, strip the shafts and your done.
old mechanics trick for tightening/loosening fasteners that rotate an engine crankshaft where you can't get at the flywheel or other side to apply a counter force against it.
Pull the sparkplug, feed in as much clothesline or rope as you can get into the bore, leaving some trailing out of the plug hole.
Slowly turn whatever fastener your working with until the piston locks up into the rope.
This will then allow you to loosen or tighten with normal hand tools whatever you're dealing with.
blue or red loctite pretty much every nut and bolt if you're worried about anything loosening up.