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Hi Fred,
I found that 19mm suggestion rather cryptic too.
Surely you want to try anything you can before drilling through the plug and infecting the lube inside. I have no experience with this particular plug, and I have this board to thank for that, because without having read someone's agonizing been-there-done-that warning, I'd have been right there with you learning the lesson firsthand.
Do you have a hand impact driver? Is there room for one if you did? Thinking heat, candle wax, and shock applied to a Dremeled slot that need not go through. In the plumbing section of the big box hardware retailers, they have thermal blankets for soldering copper pipes. I'm guessing the heat and mechanical shock will fracture the bond between the dissimilar metals. I don't know how the wax works, but I've been amazed by it on exhaust studs in alloy heads.
If no luck, and you wind up drilling through, will you pull the tranny to wash it out? I suppose brass turnings are better than steel.
P.S. It has been a while, but I recall the fill plug in my M46 was steel, 7/16 square drive. Could yours be a replacement?
--
Art Benstein near Baltimore
I had no Monet to buy Degas to make the Van Gogh.
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