Ermes Double Roller Mechs

The Ermes Double Roller Mech is made with a patented system, the operation consist of  two rollers, one works in contact with the trigger and is constrained to the coupling lever, the second roller in contact with the shaft is constrained to the box with a pin and is free to move in an oval hole, this system stabilizes the shaft at the moment of firing, the load is evenly distributed decreasing friction. Will accept 9/32nd or 5/16th American notched shaft and 7mm, 7.5mm, and 8mm euro shafts.