I have run the ZipTy in two YZFs and both fell out. Luckily I was riding a track and was able to find them after walking it for 20 minutes. I had to drill a hole and safety wire the screw to keep it from moving in on of them. In my opinion...not a good product...at least the two that I have. Now I recently purchased the fuel screw from Stealth Racing Tech. In my opinion...a superior product. That thing is not vibrating out. It fit in perfect. It comes with a o-ring on the shaft of the screw also to keep it from vibrating loose. I purchased the option new spring, washer, and o-ring and it installed great. http://www.stealthracingtech.com/ This company was also on top of things. It was shipped out the same day I ordered it through the Internet and received three status emails...one after purchase, one with shipping date, and another that it was shipped. Great communication in my book. For almost the same price you can get a better product than the ZipTy screw. I don't know anything about Scott or the others.