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Please note that M6 original battery holder has length of about 93mm while 2x26500 is about 100mm and 2x26670 is about 140mm long.this kit will not work with the 26650 size battery.
Above M6 deep tail caps are designed to work with McClicky switch or type B AW switch and I can't guaranty work with mentioned switch.before I purchase the entire tailcap kit... Will a Zero Rez momentary/twisty switch work in this?