I am a rec climber and I currently use a RADS system for climbing SRT. I would like to try ropewalking, but most friction devices available on the market are expensive >100€. Are there climbing systems that are less expensive? I have stumbled upon the f8 revolver, that method can be used with a normal carabiner, can`t it? I have also thought about making a rope wrench, does not seem to be very difficult, do you have some tips for me?