Thinking INSIDE the box

Today I'm engraving glass horse heads for trophies. I take a horse head and make my fixture to hold the part stable, as level as possible and repeatable.
Then Murphy rears it's ugly head! The horse heads are not constant and the third one I go to engrave doesn't even fit in the fixture. Well it's head scratching time. I think I've come up with one solution, I'll hold the glass horse head in a box full of sand. This will allow me to adjust for placement and levelness. The next challenge is the actual engraving being in the best place. Because of the engraved part not being consistent, it's a tough thing to make the engraving fit each individual part. Now, here's the solution I come up with. I make a piece of acrylic the same size as my page size. I center my text and I cut a small hole exactly in the center. I place the acrylic in the best looking location for the text and make a dot on the glass using a Sharpie through the center hole in the acrylic. Now I use the red dot pointer to find my dot. I set this to my home position. I use the Epilog Center to Center engraving feature and viola! I use more power to make up for the uneven surface and pay close attention to focus. A 4" lens would be an advantage but we'll make do with a 2". Use a little denatured alcohol to take off the mark that the Sharpie made.