This all started when I decided to purchase carbide jointer blades for my old, 6" Delta jointer and measured up my current blades to find they were 3/32" thick. The replacement blades are 1/8" thick so before ordering I wanted to make sure they would fit my jointer.
To check on this I made a 6" x 5/8" x 1/8" thick maple strip and tried replacing one of the blades. The backing bars were a bit gummy with some superficial rust so I cleaned them and found the maple strip did not quite fit in with the tightening bolts backed up as far as they would go but it was very close. I then ran it through my thickness sander using a n old 240 grit sandpaper roll. I obviously applied the absolute minimum pressure so it could barely be heard and it cleaned and polished the bar beautifully. In total maybe a little over a quarter of a turn on the adjustment and about 6 or 7 passes, the maple strips now slides easily into the jointer head.
I am not recommending this or planning to do anything similar in the future but it worked for me.
Has anyone else tried something similar?