Found some good info here-
http://thezenofcycling.blogspot.com/...ragged-in.html

Tom wrote: "The frame design was mine, the same exact design I developed for the first Ross Signature racing frames. Unlike the rest of the Ross bicycles made over the years, the Signature frames were real hand built frames, as good as any made at the time. I was very proud of what we did there. The guy who built that 508 was good enough that I hired him away from Ross and he is still working for me to this day, twenty six years later. You've got a little piece of history."

The only caveat to add is that Tom had left Ross in 1983 and Jim Redkay was running the shop by then. In all likelyhood, Jeff Duser _did_ make the frame, but the 508 Triads were built by a team consisting of Jeff, Juan Rodriguez, and Dave Rodriguez (hence the 'triad'). So truth be told, I don't know for sure if Jeff actually built my frame. I asked Tom for more detail, but I haven't heard back. He's probably tired of me annoying him (like you don't know that's possible).