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Looks good, that should hold. I think you need a minimum thickness all around the insert. Not sure exactly how much, but there is probably an old rule of thumb somewhere. Looks like the original one was just too close to the end, that's probably where the split started.

_________________
Phil

http://www.oleninstruments.com

"Those who tilt at windmills are only considered insane by those who can't see the dragon."

And I fell into the "if a little tight is good a LOT tight is better" trap.