Mike Steiner..500 Fanatic did the original build. We talked extensively after I bought it. I've bought lots of stuff from him in the past, very good guy.
He put a lot of very good work into it, especially the extra cylinder and case reinforcement..a well known weak area. He sold it before he ever ran it. Of course I just had to look inside when I got it. I took it HPR for his opinion, He made some changes, we ran the motor...had to tear down again to fix the o-ring issue. Its good to go now.
P.S. the compression release is a nice feature.........