I just received a few vintage tailpieces from a member here (big thank you to him!), and I was considering having a few copies of them made. As close as I can tell, the body, the part the bolt goes through, is 0.055" thick, and the other part, the part that the strings go in and change the angle, is 0.046". This is with nickel plating (maybe chrome).
If I were to have some copies made of them, what gauge(s) of brass sheet metal should be used to ensure they will not bend?
I recommend 3/32 (0.094). Specify that material be annealed prior to and after bending.
Here's a resource for buying small quantities of brass, including annealed sheet in various thicknesses.
I'm a metal fab guy, and I've bought a bunch of various materials and always had good results. Not the cheapest. But you can buy only what you need, rather that a full 4 x 8 foot sheet!
'Nail polish finish repair' 57 min
'c, d7, open' 1 hr
'Leaving the Bunker' 3 hrs
'Old Washburn E 329' 3 hrs
'Ten Broeck & Mollie' 3 hrs