• Underneath the black putty, the anchor bolts are flush with the anchor. No way am I getting an angle grinder in there?

    I did not hammer a ball bearing into the hex slot at the top of each bolt though. In the forward thinking I might have to dig this up at some point in the future.

    Do you think an SDS drill would be able to get them out, even though they've expanded their casings into the concrete?

  • If you've not used ball bearings, can you not just try removing the putty and undoing the bolts? Failing that, new HSS metal bit (or a few) about the size of the holes and drill out the bolts.

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