About 8-9 years ago, I helped a friend recondition the tilt cylinders on his antique (1956) Clark forklift. The old seals were mostly leather! - so we got some new ones turned up out of urethane.
We honed the cylinder bores beautifully, but one ended up just a whisker smaller diameter than the other. We fitted the shaft and piston with the new seals to one, no problem.
We tried the other one - but the piston and the new seals jammed a third of the way into the bore, and we couldn't move the shaft, in or out.
So what to do? O.K., we've got air in the shop, put a bit of air pressure in the cylinder, tap the shaft, and it'll just pop out. But we got to around 60psi, and the shaft still wouldn't budge! Try a little more whacking with the hammer! Yep, that worked!!
The shaft released alright! - and launched itself, with an almighty BANG! - out of the cylinder, and across the workshop floor! - leaving both of us just a little stunned. Just fetch two pairs of the brown corduroy trousers, will ya??
Should've been old enough, and wise enough, to know better!
We went back to doing another 30-40 minutes of honing, and this time around, the shaft and piston fitted well!