Originally Posted by papalok
A bottom bracket spacer worked for me. A fixed friendly lbs might carry some. You might get lucky and find a 2mm one.
Good idea. I like this suggestion best. Cheap, and fairly fool-proof. The second best idea is not worrying about being off by 2 freaking millimeters. I've got a converstion that is off by a good 5 mm, with a ramped and pinned chainring, and I don't have a problem with it.