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Sirio - AC/U + 4M.CAVO/PL


My Sirio Performer PL5000 hard mount just came in from DNJ.

In the pic below,I'm trying to figure out if the big ring is supposed to stay on with the antenna base screwed down on top. The big black ring isn't threaded but is knurled on it's outer circumference. Looks like a cammed round wrench for the small black threaded round thing. The small black ring screws down on the SO-239 fitting and is cammed to fit cam marks on the big black ring.