To fix - hide the dovetails a piece of steel was filed to shape and tapped into the first one

A bit of cleaning up and it would almost hide with a touch of blue

The centre one was done the same but would be used to position the barrel mounted sling eye. A piece of shotgun barrel was used to make a base for the sling eye

a hole was drilled into the dovetail, the sling screw was cut and a groove made round the stub so when it was all soldered together it would make a good bond.