Ball bearing swivel bases feature dual rows
of Delrin® ball bearings that swivel freely even under high loads. Bases
include stand-up springs and a U-adaptor to accept a variety of
This Duocam Cam Base — Swivel features a
second cleat for lines led vertically through the base of the swivel. It
is frequently used to combine vang or backstay controls in the same
swivel base that handles the mainsheet.