LaserWriter Pro 600 problem

[wcbland@pacifier.com (Bill Bland)]

I picked up an Apple LaserWriter Pro 600 at a surplus sale. I've
cleaned it up and it'll print, but there's a problem I hope someone in
the group has seen before and can provide a solution to.
Sometimes, the printed page will not fully eject. At the bottom of the
page, it looks as if it had been wound around a pencil. There's a
definite accordion fold to the paper at the bottom. It was worse
before I got inside and found that a piece of paper had been fused to
a roller. Getting that off helped a lot. But, there's still a single
"groove" about two inches from the bottom of the printed page. 
What am I missing?
Thanks for any help,
Bill