Ok let’s look at it from the Old mechanics point of view. There are different types of brass. Some brass is slippery. :-)
The material is used as a normal wear part, it is used a LOT, in harsh environments. It has a different dampening effect depending where and how it’s used.
Brass securements with "double binding" washers won’t back out, IF they are torqued correctly...
When things are tight, they do not vibrate. IF thing are NOT tight they will BREAK!!! Ok you can add all the HOOP la you want..
IF IT’S tight, it won’t vibrate, if it’s loose it will...
The speaker rim (for the lack of a better name) needs to be
Secured correctly, with the correct binding head and locks
FLAT, not warped, torqued, in sequence and correctly.
SEALED, it CANNOT leak. AT ALL!
I’ve used Brass, Bronze. Copper, Stainless, Sheetrock screws (high carbon I reckon) internal HEX, Torex, la-te-da.
I use what looks nice, and I can torque to correct specs, easy Dudes and Dudettes!!
If it’s tight, and sealed, it’s dampened, and right...
What does that mean to me. ANSWER. The screws should NOT make a difference, if they are TIGHT.
LOOSE YES, Not torqued correctly, YES. Not torqued in correct sequence, YES.
Easy check, get a stethoscope, scope every screw UNTIL it has the same tone.. Just like tone tuning a spoke, wheel.
I bet YOU can hear better than you think, with a good tube scope, or a heart scope will work (10-20 USD) I use them all the time. STILL
LISTEN. You’ll see, or HEAR. :-)