I have a belsaw 910 planer. We have had the thing for about 10 years and used it on and off. It had worn feed rollers and such so I decided it was time for a new feed wheel kit. So I got the new urethane rollers, springs, and brass bushings. I installed it just as the manual stated. I finally got some red oak to plane, and at first it didn't work very well. So, I tightened the spring for more downforce on the bushing. I ended up tightening quite a bit more than the manual suggests and it works pretty good, but about every other board I have to help it by pushing on the board lightly. I would really like to get this thing working a little better. I have the planer completely polished up with paste wax. So I don't believe it's a drag issue. Any ideas? Oh, and on the red oak I was only taking off a 1/16th. The knives are freshly sharpened. And, it's powered by a 5 hp motor.