Harry,
That is absolutely true, not only for the Miller but most singles. More specifically it is the distance between the upper and lower tangs that is important and screw tension can affect this. The distance is set when the installation is done and is the most common cause of malfunctions down the road. The trigger mechanism itself is just about bulletproof once it is made and hardened, changes in its relationship to the wood is usually the source of problems.
Dan
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