I use the Grip-loc system in all of my equipment and I have plugged many balls without any isues. The only thing with plugging a hole that big is you have to do it in two steps. First do half of the hole with the clear plug. Then when its dry, you can finnish off the rest with the rest of the color matched plug. If you dont wait long enough then the plug will crack and youll have to drill out that area and plug it again.
--------------------
To be the best, you must bowl with the best! Ebonite - BOWL 2 WIN!