This article suggests the rollers should be 5/8" diameter:

http://www.ohio.edu/people/schneidw/..._bearings.html

However, my enlarger has 3/4" rollers. They are shot, and need replacing. There is some adjustment available if the rollers are not exact, but if the rollers on my enlarger have already been replaced with the "wrong" size, then I might already be almost out of adjustment. Should I switch to 5/8" rollers per the article, or match the 3/4" current rollers?