ERMES Double Roller Trigger Mechanism
The Ermes Double Roller Mech is by far the smoothest, strongest mechanism we have come across. It is made with a patented system, the operation consists of two rollers. One works in contact with the trigger and is constrained to the coupling lever, while 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.