Lew,
It sounds to me that you've drilled out too much of the plug and not left
yourself enough to get a hold of. The plugs are 1" OD with a 16 tpi thread
and 55: pitch angle. If I'm right and you haven't left much material, I
suggest you go even further and drill or bore the hole to 7/8" or a shade
larger, and then peel what's left of the plug out of the thread. A little
heat will help to loosen what's left of the plug, but don't over do it !
Cheers, "Bob".
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