Potting
Hi,
Epoxy potting is likely the way to go. With sufficient depth and radius, you can get actual throughbolt strength by lagging into epoxy. Gougeon has data on hole size and depth for a given fastener size.
Oh, and just wetting the screw hole with epoxy before installing increases pullout strength by about 50%. Marvelous.
Fair leads,
Brion Toss
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