Yeah, know all too well about breaking the wheels. last time I used one I brok 3 in one day! pipe had some pretty bad stress on it and kept biting a nice smiley face in them. This was 3" plastic in 4" and the gas company super wanted the windows to be about 3 cutter lengths long just in case they needed to go back later. That made for some interesting days. Like you said it has to be the worst to mess with. Glad that we don't do many of them. Not sure which is worse to work with... the 208 or a 4" groundhog.