I bought a set of Acerbis X Factory Handguards for my Ranger. I intended to run a tap into the end of the bar and install an insert. I have done this on my other bikes using a 5/8 inch tap. Well, the renthal stock bar ends are a lot smaller than the 5/8 inch tap. I have another smaller Bosch tap,12.5 to 13.00mm that fits and cuts fine but I need an insert to accommodate the smaller handguard mounts.No one seems offer any inserts or kit for these twinwall renthals. Any ideas?Also, are renthals twinwall and Renthal fat bars the same?