Cycle Repairing and Adjusting
With a Chapter on building a Bicycle from a Set of Parts

104 CYCLE REPAIRING that the brass inside, when it melts, will tend to flow to the outside of the joint. Then if borax only is used on the outside until brass appears round the edges, it will be fairly certain that a sound joint will result. As soon as this comes through, feed a little brass-and-borax mixture to the joint, and as soon as ever this melts, stop the flame and remove from the hearth. If the flame is kept on too long after this there is a possibility of “ soaking ” all the brass out of the joint, especially so if the joint is not a very good fit. Some braziers use the blacklead mixture for protecting Fig. 45.—Section of Jointed Tube showing Liner thin tubes whilst brazing ; but if this is used, care must be taken to keep it out of the actual joint, as brass will not adhere to metal where this is present. When tubes are brazed together end to end, it is well to use a liner, as shown in Figs. 44 and 45. Filing Up.—For filing up and preparing for enamelling, a vice, files, and emery-cloth will be required. Necessary files will be a 10-in. or 12-in. bastard, 8-in. half-round ditto, and 8-in. half-round smooth ; and a pair of hard- wood block or vice clamps will be useful, and prevent the tubes getting damaged by the vice jaws. They are easily made ; get a piece of hardwood 5 in. by 3 in. length with the grain. Bore holes as required through the centre, and