Join Date: Feb 2007
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I've used a small section of bent coat hanger (90 deg) chucked in a drill to remove such areas. The trick is to start small and slowly get bigger until you hit solid core, It took 3 different sized "Bits" then I used a shop vac to remove the debris, wiped down as much of the area that I could get to with acetone and filled with slightly thickened epoxy.
The area I worked on was about 4-5" in circumference.