Reply by MrUnix

Does sound like wrong screws.. maybe 10-24 instead of 10-32? Too long maybe? Get a depth gauge and verify the hole depth. If it’s good, run a 10-32 bottoming tap down ‘em to clean up the threads. I doubt you have enough space to drill and re-tap to a bigger screw, but maybe. One last alternative.. just don’t use them! Nothing says you have to have jack screws and there are about a zillion jointers/planers out there that don’t have them and work just fine. They are just there to make it easier to install the knives and have nothing to do with the operation of the machine itself.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid