Page:Dorothy Levitt - The Woman and the Car.pdf/110

 and exhaust valves being pitted and needing grinding in. To grind in use a little emery-powder and oil, and plenty of "elbow grease" until you succeed in eliminating all the little pits and making the surface quite smooth. (Be careful to clean off all traces of the emery after grinding.)

Platinum point and screw adjustment.—The platinum point on the trembler blade or screw occasionally gets worn uneven. When contact is made, if the adjustment is not correct, the point will get worn down on one side and the engine will probably develop a "knock" and you will not be getting the maximum horse-power out of it. It is a simple matter to smooth the points, but a delicate touch is necessary. The filing must be done with your finest file, and a very few touches are necessary. Should you not happen to have a very fine file with you, the points can be smoothed with emery-paper, but care should be exercised in its use.

Again let me warn you to have the electric current switched off before making any of these repairs or adjustments, and particularly