I have brass anchors like below in the concrete deck around my pool.

Today, when I was raising the inner screw to install the cover, the screw was being very difficult. Trying to raise it, the inner piece snapped. Now I'm left with a the inner piece broken and no way to loosen/raise the inner screw.

What is the best way to remove the entire device without damaging the concrete?

EDIT: Anchors were installed after the concrete was dry, so there is no conformance to the shape of the anchor.

brass anchor

  • There isn't one - damaging the concrete is required for removal. You can go anywhere from a diamond core drill a bit larger than the anchor (on the drill bit's inside) to a sledgehammer (ie, degrees of damage can vary) but you cannot get that out without "damage" - it's locked into the concrete by its shape. – Ecnerwal Oct 13 '14 at 1:40
  • @Ecnerwal - see edit above. Anchors were installed after the concrete was dry. – Jason Oct 13 '14 at 14:57

Being Brass, the anchor is nice and easy to drill, Just get a Steel drill and slowly drill into the remaining anchor. once you have drilled through 90% of the brass, take a long nose pliers and "implode" the rest of the material into itself.


A slide hammer would be the most likely to work in that case. Drill a hole in the broken part, screw in the tip of a slide hammer, hammer it up and out.

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Using a penetrating lubricant and a screw extractor to get the broken threaded part (only) out would be an alternate approach.

Be sure to apply anti-seize to the threads of all the ones that still work, and the new one, to reduce your odds of having this type of problem in the future.

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