Fig. 11.
Then push them into either end of the boiler about an eighth of an inch from the edge, as in A ([Fig. 11]); they can now be soldered in place, and you will find your gas blow-pipe very useful here. The projecting flange should be hammered down all round, like B ([Fig. 11]), which can also be sweated afterwards with solder, and finished off with a half-round file.
When filing solder or lead, only use an old worn file, as the soft metal soon fills up and spoils a good one, and although it can be melted out by heat, it is not advisable to do so.
You will now require to drill a hole at A ([Fig. 10]) for the chimney, which should be three-quarters of an inch in diameter. Then cut a slot in the bottom of the boiler six inches long by an inch and a half wide, commencing a quarter of an inch from the forward end of the boiler.
Fig. 12.
Fig. 13.
Fig. 14.