I have an Autohelm 3000, I named him Oscar, I love Oscar, he steers better than I do, then Oscar broke his leg, I mean the lever that tensions the belt broke. I repaired it several times before looking for a replacement part. I found this source,
http://i3dgear.com/ who had made an improved handle and cam. I ordered one and it works fine. The site is run by Rick Wallace and he sells other Autohelm parts and has made improvements on OEM parts. He also has a technical contact who had worked for Autohelm if that help is needed.
While not state of the art, this unit still works fine and I see no reason at this time to spend boat bucks for a replacement as long as parts are available.