Replace buckled or injured grids with new ones. If a plate has a considerable portion of the minim, or lead, broken or removed, it is always well to take it out and put in a new one as the grid in such a case has a reduced surface. CONTACT POINTS.--Examine all contact points, and clear the air vents and terminals, and particularly note how the wires are arranged within the case, so they will not be subjected to vibration and thus affect the terminals. The utmost care should be exercised to line up the valves so they act at the proper time in the revolution of the crank shaft. Usually the inlet valve plunger has a lock-nut adjustment, so that it may be set at the proper point. The points are indicated on the fly wheel and engine base, and when they coincide with, say cylinder No. 1, which is usually taken as the guide, the contact must be made between the valve-stem and plunger. If you find that the contact takes place before the two points are opposite each other, the valves open too early. THE MAGNETO.--The only difference between the magneto and the battery system, as applied on cars, is in the method of obtaining the primary current. The magneto dispenses with the battery cells, the coil, the commutator, or contact breaker, which must be used with the battery, and the switching plug. Instead of the foregoing elements however, the magneto requires a contact breaker, and a condenser. It is, therefore, much more simple to examine and keep in order, than a battery outfit. The magneto, owing to the fact that it always has within itself the means to generate a current, and does not deplete itself, is far preferable to a battery. Owing to the high tension character of most magnetos, the spark is also much hotter, and for that reason the ignition is more positive. MAGNETO IMPULSES.--As the magneto gives out impulses of certain intensity at each revolution, which impulses are designed to actuate the sparking mechanism at certain definite periods, it is obvious that the contact breaker must be properly set. TIMING THE MAGNETO.--This is what is called _timing_ the magneto, and it is one of the things necessary to observe, and to be able to adjust, if it is found that, for any reason, the disk, or the wheel of the contact breaker has turned on the shaft, as will sometimes be the case. All mechanism of this kind should be “spotted,” that is, have punch marks on the disk and shaft so that it can always be put back to the proper operative position, or nearly so, and thus save the time and labor required for retiming. In general, however, it may be said that the magneto is one of the mechanical elements, which needs less care and attention than any other part of the car, and it is safe to examine and go through every other part of the machinery before attempting to tamper with the magneto.