i think the right way would be to use a peel washer. i recall seeing a post about it somewhere on here in a discussion on timing a ROSS break.
what i wouldnt be able to even being to help with would be a peel washer of the proper size we need for the thread size on this caliber.
maybe someone here as a good source for one
google came up with this , but it doesnt say if the PN listed there is for a crush or a peel washer.viewtopic.php?f=2&t=4995
since SD was willing to hook you up with a brake, maybe they can help you source a peel washer too, or at least give you a viable option for clocking that brake correctly.