In reply to:

Sterling silver would be too fragile if you turn them to much they will snap.



Yeah, but you're not supposed to tighten those bolts very much anyway. Brass screws abound, as do aluminum, although not in hex bolts, it does show that soft metals can be used for screws at least. Certainly sterling silver would hold up equally well.

Stu
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If you want it to break, buy Sony!