This is the holder I use http://www.noga.com/nogaProducts.php?prdID=DG61003 It will hold any one of my dial indicators without any other clamps. The 1954 GMC maintenance manual specifies .007 max runout. They also recommend oversize dowel pins rather than offset dowel pins. I am referring to Sec. 8, page 196. I don't know how in the world one would install an offset dowel pins. I see that my guys dial in a flywheel housing every time we pull a transmission. It only takes about 15 minutes to check one.