I have been playing during practice throwing two handed.   I actually get less turn on the ball, but the ball seems to hit harder and my balls react opposite to how they do with one hand.   I digress though.  

I injured my middle finger so yesterday I tried two handed again with just one finger in the hole, 245, then galactic bowling started, 220 and a 190.   My question is, what is legal and illegal with fingers covering the holes, furthermore, can you get a weight hole drilled so you can then put your both hands in the ball.  Meaning, I am a righty, so I hold the ball in my right hand, but to then put my middle left finger in the hole to get extra turn/leverage on this.  Has anyone tried this as well?

Thanks in advanced.