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Old 03-04-2021, 04:20 PM   #153
popgun pete
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Re: Double Roller Trigger for Pathos handle, Ermes Sub

What may make the trigger hard to pull is the sear lever and trigger not exactly lined up on each other. In many trigger mechanisms the housing walls act as cheeks that the levers slide past, so they always line up on each other provided their edges are square cut to the side profile of the levers. When levers were stamped out they often were not! With cut out levers in a folded metal housing the levers often have a significant clearance on either side which can cause the levers to not sit in exactly the same plane and be at a slight angle to each other longitudinally. This means the roller contact on the nose of the sear lever does not sit square to the curved notch that it engages on the top of the trigger. The contact not being fully across the engaging faces pushes contact pressure up and increases the trigger pull. The plastic washers in the housing on either side of the sear lever are meant to align the sear lever in the housing by centralising it, ditto for the wound double leg biasing springs either side of the trigger, but they don't always achieve this. Any misalignment of the pivot axle holes can also cant the levers preventing them sitting square to each other if the axles are not exactly aligned and parallel in a folded metal housing.
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Last edited by popgun pete; 03-04-2021 at 05:17 PM. Reason: added a photo
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