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Hopefully the OP doesn't mind me piggy backing a related question.

How does one remove the heli coil on the center stand to tap it deeper?

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I got in behind the original insert with a pick then grabbed it with a pair of needle nose pliers and twisted it back out. I then set the head up in the mill/drill press and used a close fitting drill bit as a centering device and clamped head. Then chucked the appropriate drill bit and drilled I beleive 1.250 inches further? below the bottom of the rocker stand then tapped new threads and installed the new 1.0 inch long inserts I got from MSC. I used an arp stud. I can probably find the part number if anyone needs it.