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The particular design of the NUT II P three-in-one nut-washer-cap combo combats annoying lens wobble by providing inherent torque even if nut is loosened (standard metal screw/nut/washer combinations, upon slight movement, lose 100% of their inherent torque, thus leading to the annoying loosening of frames).
The special design of the polycarbonate coating over the metal nut performs three functions:
Replaces plastic cap
Replaces plastic washer
Retains nut torque in place of “locking resin†traditionally used on screws