what is the trick to drilling a 3/4” home in a pine slab that’s 2-1/2” thick for a 3/4” solid bar 8” deep. I’m trying to install a set of floating shelves. The brackets are 3/4” x 8” and I’m using a 3/4” wood bit. I’ve tried to wallow out the home and even used a round file but it will not go all the way in.