Replacement Sonus Faber grille strings?

I had tightened my Auditor. However, after 2 year, the strings will lose the tightness again. We cannot tightened twice, all the strings had lost their elasticity.

I bought a pair of Sonus Faber Concertinos without grill covers. Can anyone point me to the right source where I can buy the grill-covers? Many Thanks!

I am missing 1 pc. of the Sonus Faber emblem at the bottom of the grill. Can someone point to where I can buy a replacement one? Thank you!

GUARNERI HOMAGE GRILL STRINGS- (used to be) $600 PLUS SHIPPING- special order from Italy.
I GAVE UP AND REMOVED THEM. THEY DO LOOK NICE, THOUGH.
BUT if they don't provide any protection at all, and they don't last at all,
it's really nuts- unless someone invents a regular cover replacement that fits onto the speaker. I don't care if it blocks .01% of the upper frequencies.

@french_fries I think that price from SF was for the material only, then you had to have someone string them...another crazy cost!
I certainly hope someone would invent a grill replacement that would fit on the speaker. I have been recently tightening up all of my strings, wth some success...BUT this is a temporary fix! Who knows what happens once the strings on the stands begin to fail...I hate to think! Like I stated in my prior post, these strings look good, BUT IMO they are a severe design flaw due to their aging factors!