back stay mount
I am presently in the process of installing a radar with a back stay mount. It's gimballed, but without the hydraulic damping that other such mounts have. This has a bolt and a nylon washer and bushing. You tighten down the nut to get the same effect. It costed $500, whereas the others cost about double this amount. One warning: make sure to measure the angle of the stay and let the manufacturer know what it is; the mount as it was sent to me does not sit level and I have to shim up the radar dome to level it. Web site for this mount is attached.