Well, 'robusting the film advance' seems to me to be the best part of using this thing, so maybe I won't have spacing issues... Feels like you are cocking a rifle. I love it. Is there a "Top Shot" for Koni users?

I'll update my search as well: I'm thinking a 180 and a 58/60 now plus at least one 120 back. The 135 seems to go for more than the other 2 lenses combined.