NVDucati, do share your experience with the install on your RE when you get to it...
If you are saying the first one on the list... you went with the - Model # MCVICO – Fits many Honda motorcycle with 7/8” handlebars.?
Yeah, it is the first one as you note. The main thing is to get it for the 7/8" bar size (they have them for 1" as well).
AS for mounting them, one has to keep in mind that these are friction devices such that when you "thumb it on" while riding it is just a bit more resistance than the return spring on the bike has pull. It never really "locks" it. The resistance has a screw adjustment. By removing that screw it will hinge open to around the handle bar so you that you don't need to remove the grip to install.
You will notice that on the underneath side there is a "foot" (my term). It is a 90° bit with a slot on the horizontal section. That slot it to capture one of the throttle cables just to keep the Vista from rotating when you twist the throttle, either way. It is a "universal" gig so you will need to do a little something to keep it around the throttle cable. For me, I just go ahead and drill a small hole on the vertical section near the bottom. The hole is just large enough to accept a piece of safety wire or a paperclip. On my V-2 I used a plastic tie wrap temporarily, about 3 years ago. No big magic. It just needs to be stronger than the force of the retuern spring.
AS for using it: Know going in that it is not a electronic cruise control unit. Those are sold in a different aisle
. Satisfaction comes once you learn to push the thumb lever first and THEN make the fine throttle position which will maintain your desired speed. Once deployed, you are welcome to readjust for that hill or speed limit sign, etc without disengaging it. If something sudden comes up, just twist the throttle closed.
For members who ache for old guy stories, before thes came out in the early '70s yes there were built in knobs surrounded by a spring. The Brit bikes of the '60s would mock them and spit that knob and spring to the ground from vibration. Personally, I had a short piece cord tied to the handle bar that I would slip into the space between the grip and the switch box. Friction. Same thing as these but these are better. It is nice to have both hands available to zip or unzip, relax your neck and shoulders / wrist or strike a pose by lighting a cigarette (kidding).