Fig. 2394.
Next comes putting in the new key and gib, or refitting the old gib. If the jaw of the gib has cut into the strap, as it will do in some cases (especially in marine and locomotive rods), this may be repaired as follows: Cut out the recess shown in [Fig. 2392] at a, making it dovetail-shaped as shown, and with a set chisel set up its sides as shown in [Fig. 2393], which is a sectional side elevation through the line of b. Cut out a piece of wrought iron and bevel its edges as shown in [Fig. 2394], filing it to fit into the recess cut at a, [Fig. 2392], and letting the bevelled edge be uppermost. Then take a set chisel and close down again upon the bevelled edge of the piece the metal that was set up, as shown in [Fig. 2393], and the piece will be riveted, and it and the gib jaw may be refitted to touch the piece thus let in.
Fig. 2395.
The jaws of the gib are sometimes made slightly taper at a, [Fig. 2395].
To refit the brasses to the jaws of the strap, the flanges which do not as a rule wear much are usually tinned with a soldering iron, and given a lining of babbitt metal. This must be done all around the flanges (of both pairs of brasses) that come on the same side of the rod, so as to keep the faces of the brasses leading fair.
Fig. 2396.