Mine did the exact same thing... Dremelled out a lot more of the wood deep and all around and then inserted cut-down drywall screws cross-wise and some heavy duty staples from a cardboard box into the Acraglass. Has not been a problem since. Others here have reported the same problem. I'm not gonna gripe. It's an inexpensive stock and an easy fix.
Oh, BTW, my "fix" does require pillars, but I always do that, anyhow.
Also, as olddav said, go with Acraglass. I usually bed with Devcon 10110, but that kept cracking. It didn't hold 'till I used Acraglass on the stock and then topped it (finished the bedding) with Devcon 10110.
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