I've not yet had a problem using silver on either shot in (fast back) or side of lug SS attachments on most of my frames. I do pay attention to how much surface contact there is, filing a groove in the lug's side to better nestle the stay end. And as mentioned the binder slot and it's stress relief key hole (and trying to keep the binder slot well over an inch long). I have used an internal sleeve to increase wall and contact surface at the stay ends only once, that I remember. I have begun to use thicker stay caps then just a tube cut off. (I make my own top eyes/caps, not a cast plug in). Andy