I am interested in seeing this.
I began planning a simple radial ball and ramp type of mechanism that would engage with a tug on a small lever from your pinky, then disengage when the throttle was rolled off. I liked my idea (who doesn't like thier own ideas right?) then bought a Throttlemiester from another member and have used it ever since...
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I don't love the TM... it is inconsistent depending on heated grip setting or temp, it makes an unsightly bulge in my throttle grip, does not provide enough tactile or visual feedback when applied/disengaged, and requires an adjustment when I add or remove my handguards(not TM's fault..thats outside of the design parameters) But.. I own it, it works as designed, is built and designed well enough to last a million years with little or no maintenance, is a nice looking('cept the grip lump), nicely machined and finished bit.
I did LOVE my Vista Cruise that i had on my KLR...I'll repeat LOVED IT.. perfect for me, loved the operation, consistent, adjustable tension, definite on or off..no"maybe"...etc.. but I worried it would damage the heated grip conductors on the Feej.. and thats expensive to fix.
Brakeaway..$200.. takes up too much space on the grip for my liking, does not look horrible, but they state no heated grips...
So.. with the TM on there working pretty well, I lost my drive to create.
If your friend is creating a neat, compact, device, with a safe, instant, release on grip roll off and/or brake application, and with a definite tactile feedback for on or off... I'm sitting on the edge of my seat.