What is your opinion on handlebar shims? Are they safe? Do they work? I've heard mixed opinions. 31.8 stem and 26 mm bars. Does this look sketchy? : r/bikewrench,Handlebar Shim - 26.0 - 31.8 mm Silver (4 piece),Nitto Handlebar Shim 25.4 - 26.0mm,Gusset Handlebar Shim 25.4 - 31.8 for Standard MTB to 31.8mm Oversize - Black