On recent builds, for earthing the bridge I've started using a strip of the self-stick copper foil that I also use for the chambers: The solder joint sits inside the entry scoop and so you don't have the worry of the wires lifting the bridge or eventually sinking into the finish and breaking contact:   And we have a fitted and earthed bridge  :   As the copper foil is out of the drawer, next job may as well be shielding the chambers.    
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