I used the same thing to bore a hole in the cradle I made.. I had mistakenly pre-drilled a smaller hole and couldn't for the life of me figure out how to get the larger forsner bit centered over the smaller hole then the bell in my head went off.. clamp a board over the hole as a guide and ding, ding, ding! A winner! ...
That, "Oh! What have I done wrong?" moment then finding a simple solution keeps me from drinking..
I figured it's time to change my signature so hold your breath. This is it.