Here is a Sidelever, sidelock, ejector gun from Henry Atkin, vintage 1894. Its bite on the rear barrel lump was welded and improperly refit, resulting in the bolt binding in the bite and subsequent very sticky operation of the opening lever. It also had a damaged triggerplate screw and needed a complete cleaning. The refitting of the bolt and bite does not lend itself well to photography so I'll just show the triggerplate screw.
The damaged screw with the new screw made, indexed, slotted and fitted flush to the triggerpate.
The new screw after engraving and hardening.
This shot shows the Atkin's sleek lines to good advantage.