I recently purchased an incomplete Dorfan 51 and a nearly complete 53. The 53 was missing the compound gear, (which I ordered from Hemming's Trains thanks to a post here on the forum), and one brush had been worn down to a nub. The solution was to transplant good brushes from the 51. The "brush" consists of a graphite brush held in a brass holder that sits on the end of a spring-loaded brush arm. Presumably you are supposed to be able to remove only the brush part and not the brass holder, but I'm looking for confirmation on that. When I tried to remove just the brush, the brush and holder came off as one piece. You can see this in the third photo. The transplant was still successful however. Also, does anyone have a recommendation for replacement Dorfan brushes for the future?