I ordered a pair of little 3 inch dia. mirrors for my Bullet. They have 5/16-18 threads on the ends of the shafts. The adaptors were made today by drilling a couple of 7/16 bolts that have 20 threads per inch [std. fine pitch] with an "F" drill and tapping them for the 5/16-18 mirrors. The 10mm/1.25mm pitch holes in the handelbars, where the original mirrors bolted on, will be drilled out to 25/64 inch and threaded with a 7/16-20 tap. The adaptors will be Loc-Tited in and the 5/16-18 shafts installed in the adaptors. Have not received the mirrors yet so,for now, all I did was make the adaptors. I'll post a picture when it is complete...if it turns out O.K. Otherwise I won't let anybody see it.