Originally Posted by jmiller320:
Try a piece of wood on each side, sandwich the gatorboard between the wood.
We agree!
A couple other suggestions to supplement Mr. Miller's recommendation...
-A 7/16" Forstner bit will give a cleaner, more accurate bore.
-Alternatively, a more common 3/8" Forstner bit can be used if you have a 1/2" tapered (+sharp!) reamer to open the bore to 7/16",
-Since you don't have a drill press (better), use a variable speed drill motor and feed the Forstner bit through the sandwich (esp. Gatorboard) slowly.
FWIW, always...
KD