"Slip the double-barrel connector onto the hardline. The hardline center conductor is a nice snug fit in the connector." This is a common statement in the homebrew methods. My hardline (Trilogy Communications 0.750") has a center conductor diameter of 4.5-5.0mm. PL-258s, et al, take something like 3mm. Is my 3/4" unique in having such a large center conductor? Mike N2MG