Hey all -
I picked up a Mechanical cruise assist from BreakAway.
I am in no way affiliated with them, just thought I could contribute with a post about a product I currently used.
the MFG website is www.brakeawayproducts.com
I picked mine up off ebay...
Install was super easy- 30min start to finish install. it works great, read up on it via the website for all the details. i can confirm it works with the aftermarket ISO grips, with the use of a little dish soap.
push button engage/ disengage and brake lever disengage.
no more numb hand/ cramps!
see attached photos: