You could save a lot of money with the Caterpillar O ring throttle lock. It's just an O ring available from Caterpillar dealers (and probably ebay!) ... part no #8M4991 or Caterpillar Part #8M5266. You have it on the right bar end weight and slide it over when you want it and back over when you don't. Had the same one for years and it works better than the proper Wunderlich one on my XChallenge. Only costs a few dollars. Photos below to illustrate.