Do we have any documented cases of the tape method not working as advertised? I haven't done a search, but would be curious to find out how many times it has failed and if it was the method or operator error that caused the problem. The tape has worked extrememly well for the 3 barrel changes I have done so far. If a no go gets me .003-.004 and tape gets me .001-.003 I will take the tape any day.