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If the bit starts to make it all the way through, you can just switch to a bigger bit. Eventually anything will come out with PB blaster and backwards drill bits, but if it doesn't just drill bigger than the hole and install a helicoil....

On Dec 2, 2006, at 2:31 PM, Jim Cathey wrote:

Well, often when drilling left-handedly, the force of the bit,
especially if it 'bites' into the body can sometimes start backing
out the thing all on its own.  Of course, if it makes it all the
way through without doing this then you've got an unpluggable
hole to deal with.
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