Take it apart and look for the spots on the spool that are rubbing and file them down a bit. Or put a piece of paper between the spool and reel and turn the spool until the high spot hits. Mark the spot and file it a little.
PM alantani also. He may have a better solution.
Here is a tutorial on a 113. Same basic design.
You can occasionally find the spools on ebay. pennparts.com is where I get my parts. They also have the schematics. I have 20 or so of the Penn 85, 285, 60, 65, 66, 67 and 68's.
Edit to add: Ouch! $23 plus they have been discontinued by Penn.
There are 5 on ebay from $5 to $30, new.