Cable Lock.
Bob, Welcome to the list. Morse makes a great little cable lock for just this purpose. It's their part number 44386 and should be available from the folks who you got your cable from. If you have trouble locating one, I know the guys and gal at the Ships Store here in Marina del Rey keep several of them in stock, because that's where I got mine. You can reach them by phone at 310.823.5574 and they will ship. The clamp goes on the body of the cable in any convenient location along its length and can be fine tuned to offer just the right amount of compression to keep your throttle from creeping ever again. Good luck, Glyn Judson, E31 hull #55, Marina del Rey, CA