I have an older mountain bike that takes a 21.1 quill stem and I would really love to have a 1-1/8 stem and 31.8 60mm rise fat bar on it, any of you guys ever try one of these stem adaptors? Seller claims it takes a 21.1 to run a 1-1/8 stem, around 15 bucks shipped, I've never used one before, seems a little sketchy but i'm hoping to hear a few "Yeah man those work great" or "I've been running one for years now with no issues" what do you guys think?