I put ATF in the cylinder and inside the case allowing it to go around the cylinder. Wearing gloves grab the case and use a paint stripper heat gun. You should be able to heat and the ATF will smoke which is a good indicator your plenty hot. A twist or two and that liner should come out.

Obviously , you need to wear leather gloves or oven mits .

A u shaped piece of 1/8 steel , or more corectly a U cut in 1/8 steel or alumn. , IF youve got it up 1/4 ,

can be slid under liner flange , and ' pursuasion ' applied . A Dowl down the bore & a whack .

Likely oiling , pressing home again , might not be fatal . Gunks probly balled , going the 1/4 .

CRC / WD 40 , harras it periodically , a few days beween . Heating etc .

Dont distort anything with to much brute & not enough subtle .

Since the cylinder flange has been pushed up 1/4" or so, I would look at making a puller. Basically, turn a ring .010" larger bore than the liner OD and a little less than that 1/4". Drill & tap this ring for 3mm screws (the head bolt pattern should be perfect), and bandsaw it in two "C" pieces. Make another plate to cover the top of the cylinder flange, same bolt pattern, probably 1/2" thick. Also drill and tap a hole in the center and screw in a slide hammer if you have one, or fabricate one from odds & ends...long bolt, All-Thread, piece of pipe for the slider, or whatever you have. 

I'm not sure if the "OS .61 clone" has a separate front housing and backplate, but if not, then mount the thing on a piece of hardwood or aluminum, which could then be clamped into a bench vise.  Having put the c'case in the vise in a safe fashion, apply an electric* heatgun to the crankcase and slam away with the slide hammer on the puller thingy. A suitable slider on the slide hammer would be about 8 oz or 1/4 kilo...a 5 lb slider would be too brutal.  Steve