Proper installation cures most problems
I use the Avery adjustable set. If you are sloppy when putting the yoke on the squeezer, then it could bind. I've had it get tight before, but I just take the yoke off, re-align everything and put it back on. Simple as that, problem is fixed!!!
Also, the pneumatic squeezer should NEVER be oiled with air tool oil, and if you use a misting type in-line lubricator, you should use a different hose for the squeezer. Air tool oil will damage the seals in the squeezer.
Grease the squeezer occassionally with the grease it came with and you should have no problems.
The adjustable set has a "D" shaped part that fits into the squeezer body. This is the part you must carefully align.