Elzetta ZFL M60 and just received a Mac's custom Tri dropin which is supposed to be for a M60 host but which is too large a diameter to fit. The lens is the right diameter and the length is super close-maybe 1-2mm shorter, but the diameter is too large by a few millimeters. Any thoughts as to what host might work? BTW, Email to Mac unanswered so far. Thanks for any help.