I'd generally agree with Palmaris Europe.

However, when faced with a X/12 Rody that absolutely flew till it ran out of compression, I figured I'd try the osrocket sleeve pinching service.
What the heck, it was a A$27.00 investment in a A$650.00 engine.

The sleeve to crankcase fit wasn't noticeably different and there was no sign of flaking chrome or anything nasty. I guess we're talking about very small measurements here, so this should not be surprising.

The piston/liners came back with 4mm of top space after pushing the piston up the sleeve as far as possible by hand. To me this seemed rather excessive but I was advised that it would be OK. I ran a couple of tanks through it and became concerned at what I still considered to be excessive piston sticking at near TDC. These Rody cranks are a bit suspect from day one and I didn't want to risk it. I then lapped the piston using a paste type bath cleaner to get the measurement down to 3.3mm, reassembled it and proceeded with the break in. It now felt a lot better and broke in properly. Feel free to laugh at the method, but it worked just fine.

As I say, I agree with Palmaris Europe's thoughts, but this was a pretty cheap experiment with really no down side. Naturally you should not expect to get a new engine back with just a pinched sleeve since the crank pin will be at least somewhat oval, for instance. So, for 27 bucks, if it only lasts one meeting that's not a bad investment.
I also would not recommend doing this.