Has anyone tried Brass cartridge mounting screws?

I use brass bolts in my neck.  My bride thinks they look nice. 

I'm not sure how hard your screws need to be in this application. I'm thinking resonance is the only issue other than magnetism. In that regard. Does anyone know where I can get plastic cartridge screws?

Mounting screws should be aluminum or titanium for best sound.

I use aluminum screws with blue tack between the cartridge & headshell. It works well. 

I bought the Soundsmith EZ mount screws because I wanted that easy method of securing my cart, I really hate the bolt and nut system, you need 6 hands to attach and then when setting up is a PITA. The Lyra helps since its threaded, love it for setup!!

I did find that the brass, alum and steel had a different sound character....but this was because of the position of the counter weight. I found the stainless got my counter weight as close to the pivot point as possible, the brass ones pushed the c/weight way back.