The Dyna group is dead for all intensive purposes. The creator who got ripped off in the purchase of his machine finally gave up since he didnt personally have the machine. Too bad in that case. OTOH from what I have learned about Dyna in my few years of ownership is that there were many variations. The owners of the brand now mostly appear to support the larger machines. They do mean well and will tell you everything they know unfortunately they dont have personal knowledge of those older and smaller machines. I have a 2400 and a 3000. I have found plenty of conflicting information. Is there something in particular you are looking for? Caprirs worked for them years ago and seems to know quite a bit about the larger machines. Post the specific questions and some people will chime in. Btw my 2400 has acme screws and a supernut (what Dyna calls it). Solid machines.