working on my Honda Fat Cat proto-type , and I need to drill and tap some allen headed bolts for the bearing retainer mod , I have the tap which is the right size for the bolt as both bolt and tap thread easily into a nut ————–here is the kicker , the thread size is 3/16 -32 threads per inch , I have looked at at least 15 different tap / drill size charts that I have and have found on the net and I have yet to find 3/16 listed , what size bit to use for the tap????