Paul,
Yeah, one of the first things I did was to pop the top dust cover and clean the rails.
Andrew,
That makes sense... I do have a 2006 MacBook so maybe that will become its purpose in life. If I didn't have the need to do coated canvas I'd just get an Isis and be done with it but this little bugger (despite being a relic in computer years) is still extremely useful. Is the Barbieri still the only new option that has a polarizer these days?
I did manage to coax it through the scans I needed to do by mounting the chart as far to the left as possible. When I have a chance I'll give it a more thorough cleaning.
Cheers, Joe