I use a regular tack. I use a circular swirling motion to gently drill it into the top of the shell, then flip it and do the same thing on the bottom. Then I go back to the top hole and slowly make it a bit bigger with the tack. This is the hole that I'm going to get the yolk and white out of so it needs to be a little bigger. I then use a 3 ml syringe with needle to slowly push air in through the small hole, now turned to face upright. This pushes everything out the larger hole and into a bowl for later eating.
It takes less than 5 minutes to blow the stuff out this way. I'm sure there's a faster way but I noticed if I cover the small bottom hole with mod podge it's almost not visible, so I don't always have to put a bead cap on the end.
I also attempted to use my Dremel bit and that was a very messy disaster.