I have been really looking forward to an opportunity to get some experienced assistance repairing 1541 drives. I acquired several on eBay and other sources over the last couple years. Some were functional, some worked after the heads were cleaned, and some are still malfunctioning for unknown reasons. I haven't had the time to dig deeper and diagnose the problems on these. I hope that I can learn more about these this weekend and get at least some of this last category working. Practically speaking, how many drives should I bring this weekend? Is 20 too many or is it possible to actually work on that many in a day? Are there common problems that can be addressed quickly, or is it more likely that each drive will require unique troubleshooting?