This is the cut-a-way of the hole I cored out with the #115 bit. If you'll notice the epoxy potting is a little thicker than with the #654 bit. I don't feel this serves much of a purpose, & both will seal the deck from future moisture, but does require slightly more work in the over sizing of the top hole to 5/16" or what ever size you choose.
When you re-drill your holes, after filling them with epoxy, try and do a better job than I did of centering your bit over the original hole or your deck hardware might not line up again.
This re-drilled hole is off set to the left a little bit. Please be careful when drilling over sized holes as it makes re-drilling that much more difficult. When in doubt mark the center points of all your holes using the deck hardware as a template.