5. Then I went into the 3/8" hole with this bit on the end of the dremel and cut out the foam. By using the 3/8" hole in the fiberglass I could run the shank of this bit around the hole and make a bigger hole in the foam core, down to the next layer of fiberglass. Blow the hole out and it's ready to receive epoxy.

5. Then I went into the 3/8" hole with this bit on the end of the dremel and cut out the foam. By using the 3/8" hole in the fiberglass I could run the shank of this bit around the hole and make a bigger hole in the foam core, down to the next layer of fiberglass.
Blow the hole out and it's ready to receive epoxy.