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

MISCELLANEOUS REPAIRS 143 Do not, however, saw right through before brazing, or when hot it will open out from the tube. The head lug may be brazed first, the joint being loaded from the inside with about half a thimbleful of a mixture of No. 3 spelter and powdered borax. When cold the seat lug joint may be loaded through a hole punched or drilled through the top of seat tube into the top tube. Care must be taken not to burn the tubes by over-heating, as it must be remembered that they have been brazed and filed up before. Use plenty of borax on the tubes outside while heating. The job may also be well done without taking off the head tube, by cutting out the top tube and fitting a new one. Then the top head lug would remain on the head tube and only the piece of top tube would be unbrazed from the head lug. j Drilling Rims.—It may sometimes be found neces- sary to drill rims. The holes are drilled half one way and half the other way. Mark the rim to be drilled with chalk, by placing it on one already drilled, or, in the absence of this, by dividing it off with a pair of dividers. Then centre-punch, holding the rim on a block of hard wood cut to shape. Then, if drilling on an ordinary lathe, measure the width the hub flanges are apart, and pack up the rim on the lathe bed, so that the centre of the rim is the same distance below the drill point as the width of the flanges. Drill every other hole, then turn the rim over and drill the other half. The drill should run at a high speed and be kept sharp ; a twist drill should be used. With rims of the Westwood pattern a