Friggin camera rechargeable battery is dead...
SOMEONE didn't do their job here at the office.
Anyway, Joe just shoot me a Pm with a mailing address. I will put a few different burs in an envelope and send them this afternoon.
They are extremely small headed/small shank burs but most standard drills adjust down to where the prongs will actually touch each other so they should tighten down onto these burs too. I am sending a few carbide burs with a diamond or two that may work just as good, they just tend to dull down quickly so change it out if it cuts to slowly.
A dremmel is a friction grip that is only set for a certain size shank so these will not work in a dremmel. Your regular drill should work though.
Remember, use lube and light pressure- let the DRILL and bur do the work not you muscle man. LOL hahaha Take you time... these burs are not going to rip into that metal...let them do their magic.
Your first cut notch needs to be deep enough to allow for adequate torque to be put on the bolt with the screwdriver. If you make it to shallow, you will buggar up the top of the bolt and have to cut farther down into the bolt which will be harder to access as you get down into the mount itself.
Good thing is... as long as you don't cut into the mount- you can do no more harm than you alreay have. You will always be able to bring it to a gunsmith and get it taken out. Good Luck