Originally posted by fraz
Even zip ties can damage the edge of the really soft pistons we use nowdays. Since you got the sleeve that far out, find something you can set on the top edge of the engine case next to the sleeve to use as a fulcrum. Then get a wide blade screwdriver and lift it out from the bottom of the lip on the sleeve. I typically won't use the word "pry" but essentially that is what you will be doing. Just be smart about using the fulcrum and you will not damage anything.
The only time this hasn't worked for me was when I had sleeves that were cracked all the way around the transfer ports. Then you'll be lucky to get it out at all because the edges of the sleve dig into the inside of the case like fishing hook barbs.
Use this trick in combination with heating the crankcase with a heatgun.