I have made my own pinching tool that works very well.
I used a collett from our bridgeport and machined a holder for it. I then mounted it on a flat piece of steel so I can hold it.
The collett is threaded at one end, It slides in the holder I made and I use a torque wrench to pinch it. Very easy to control.
I have done quite a few and am very happy with the results.
More people are finding that I have this and are asking me to pinch their sleeves.
Most of the time it does seem to give the engine a bit more life but it has lost a little bit of performance. Still good for practice or a back up engine if needed.
Greg Esser