It's not often when I can't figure something out but this throttle assembly has me STUMPED!. It was on a 1968 Bonanza and the bike appears to have original everything. The Bonanza guru's say that they used "Cherry" branded OGK grips and Doherty throttles. Mine has OGK grips but not with the "Cherry" logo and I can't match it up to any Doherty throttle. Also note, there's no tension adjuster or even a blank where it normally goes. The next thing is, the ball end of the cable pulls through the end of the throttle stop unlike the barrel ends that push in a hole in the side. Everything about it is different than ANY throttle I've EVER had.