Mark, read somewhere recently where someone took 4 of the plastic disk used to move furniture and placed on some wood in a V formation as an aid to rolling by hand. Might make it easier, though not a motor base. Was lucky and got one with 3 tubes for $25 at a camera show a couple of years ago...my problem was with the negatives moving around and overlapping..went back to trays...been looking at the Summitek (sp?) cradle.