> If you simply drilled a hole in the center of the void, I'm not surprised you had problems.

that's exactly what I did

> If you drilled two holes at oposite edges of the void, and used
> one to squirt in and the other to vent, I'd expect that to go much easier.

that would be two holes at the top on opposite sides, right?

> Also, if you're not too worried about the wood finish, you can cut out the
> voids surface skin and slather epoxy in with a spatula.

I did that once, I'll do it again on the one that drill through, since the structural integrity is obviously compromised.

thanks again.