Setting flat back swarovski crystals

I hope someone can help me. I had found a resource for this a while
a go, but can’t seem to find it now.

I’d like to embed swarovski flat back crystals onto sterling, not
just glue on top. They are 2.6 mm crystals and I have a dremel. What
should I be using to make a little recessed hole to glue into? There
round burs, should I use those? I have one and it makes it kind of
curved hole, not flat. I’m not sure if that makes sense.

This is a link that shows what I’d like to do, but with my own
sterling.

Thank you!

For this purpose, I use cylinder burs, inverted cones, or pearl
drills (the type similar to a paddle drill bit that is used to cut
seats for half-pearls).

Yvonne