Quote Originally Posted by Hotsauce View Post
Put the head back on with the remaining bolts, a little more than hand tight.

Look in mcmaster carr, or msc catalog, and find a drill jig bushing that has an od the size of the hole in the head.

buy a long carbide center drill, and using the head and bushing to center the drill, drill a pilot hole in the old cyl bolt.

Once you have this done open the hole to correct size for extractor.

John C.
good tip to remember. Is this the item your talking about? http://www.mcmaster.com/#drill-bushi...liners/=8i41m1