Yay !
Thanks everyone for putting me on the right track. I found I had to jiggle and wiggle the piston "just-so" to get the rings to work themselves into the bore. No way to do that without the jig to hold most of the weight.
So now is a good time to ask about the correct orientation of the bottom crank seals. Both facing like this?
IMG_20161108_154459.jpg[/attachment]
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