Cammate slip ring for crane/jib head, Stanton, Jimmy Jib or other

Description

For sale Campmate slip ring. I purchased it about two years ago with idea of retrofitting our crane head but that never materialized. I think someone else may find better use for slip ring.
Seller told me that slip ring is new, I cannot confirm that and listing it's as used. It's in excellent shape though, it may be brand new as well.
Dimensions are:
-Outside barrel diameter: 98.5mm
-Barrel height: 46mm
-Rotating (inner) barrel diameter: 52.4mm
-Rotating barrel height: 61.7mm
It's "dual stage" slip ring with two independent rotating barrels. Inner one consist thin wires routhed through the center of slip ring and 6 larger wires routed through outer barrel.
It's very high quality slip ring with real ball bearings, very light movements, no any parasitic drags.Must have for any serious crane head.
Local pick-up in Seattle (WA) is free. PayPal and all old good payment options are accepted.
Insured shipping in 48 states . International shipping around the world.
I'm not sit behind computer 24/7, but will try to answer questions in timely manner.
Thanks for bidding!