Ermes Double Roll Mechanism for wooden speargun builds is 100% handmade in Italy. This mechanism utilises the Roll system, combined with another roller that interacts with the trigger, thanks to its internal innovative components (patented).
This system allows sensitivity on the trigger, unheard before with traditional mechanisms, to high loads whilst maintaining very light trigger pulls. The Roll system has a maximum of 0.5 kg trigger holding a force of 300 kg !!! Watch video here: https://youtu.be/ZZGdaQg6K2w
The Double Roll model is the latest of the Ermes mechanism productions. It is a bit longer than the Ermes Back line model. For those wanting to maximise the length of the gun, in fact, this model allows you to gain about 7cm of band stretch over a standard mechanism.
It presents internally two rollers of diameter 7mm in 17-4 PH steel, for greater strength, wear resistannce and minimal friction. One of the two rollers is independently constrained to the housing by means of a roll-pin that lets it move freely in its seat.
The other roller is fixed to the front of the sear lever and is captured between two longitudinal cheek plates that run parallel to the sear. This roller supports the sear directly on the trigger, limiting the friction that is created between the sear lever and trigger, preventing seizure between the two components when they are subjected to strong traction. The sear lever is composed of 3 pieces joined and made integral with each other by two screws, that combined measure 10mm in thickness of stainless steel, giving enormous rigidity and strength.
The stainless steel of the mechanism is highly polished, with all edges radiused and smoothed.
Another oustanding feature of this mechanism is that it can accommodate both round-cut European and square-cut American spear shafts. The Double Roll mechanism suits most spears in these two tang profiles. Any exceptions can be accommodated by a roller change. Enquire for more information.
The Double Roll model comes with a long top right side line release. This can be changed to the left side as required.
There is also an option to choose a standard long trigger model or a short trigger length for narrower speargun builds.