Correct screwdriver?

I’m looking for the correct screwdriver for resizing and properly securing the bracelet on my new Speedmaster 1861 (005 model with the two screw design holding the pin in place).
I’ve read up on it here and elsewhere and couldn’t pinpoint it. If I read correctly it’s a 1.9 screw slot. Can’t find a screwdriver from the top brands like Bergeon for this. Others said that 2.0 is fine. Which I believe would also be the right size to work on my Rolex Sea Dweller 16600.

Can anyone confirm the size and recommend a solid tool? Otherwise I’m planning on getting a plastic bracelet holder and some Loctite 222 to secure everything.

I have used a thick 1.5mm for this purpose, assuming your Speedmaster matches the watches I've done.

I use 1,6mm Bergeon screwdriver.

To me the Wera 2035 (with 0,3mm x 1,8mm x 40mm) fits perfectly to the new bracelet link screws. And just a tip of toothstick with Loctite 222 is completely sufficient to prevent screws from loosening.