Interesting ! I made up my own Cramp buster version years ago from an aluminum plate and bent it around a pipe the same size as the throttle (1.25" I think) and left a "L" shape in the end of the long strip I cut out... I put in a carriage bolt with a square shank and smooth rounded head and a washer and wing nut on the other side to clamp it to the throttle .... it worked great.... I thought it would get in the way but with it clamped on the end of the throttle it didn't get in the way at all.... when my hand got tired I'ed just slide my hand down toward the end of the bar and rest my arm on it and give my fingers a break ! the dimensions were an "L" shape cut from 1/8" plate about 1" wide about 8" long if I remember correctly and the foot of the "L" shape was about 2.5" wide also about 1" with the corners rounded..... I don't remember if I annealed the aluminum before bending it but that should be done. makes sure it won't crack on you if you happen to be using 6061t6 plate ! I don't know what ever happened to it but lost it somewhere along the line.... LOL..... I liked it as the throttle could be left to snap closed but take the stress out of holding the throttle out of the fingers and transfer it to the wrist / forearm.... i think i took it off when I made the first of my throttle locks but I have no idea what I did with it..... it's not like I ever throw away anything related to motorcycles , so I probably made something else out of it ! HAHAHHAAHHA ! thanks for the links ! I may have to invest in those foam grips ! or perhaps get waterline insulation and cut it to size eh ? ( if it can be found in 1.25" I.D. LOL) that's a thought ! .... Bob.