A monoroller speargun houses only one rubber, which is preloaded thanks to the lower pulley. In the "Special" series, it is possible to increase the propulsion of the weapon by adding additional pulleys near the release mechanism and increasing the preload of the speargun.
The set up with inverter tires allows for more power of the monoroller speargun, greatly reducing recoil and increasing rod speed. However, a second upload will be required to use this setup