You can search for an engine shaft based on the number of teeth and the total length in relation to this searching method. First, you enter the number of teeth on the outside followed by the number of teeth on the inside and then the total length. You can easily measure this length using callipers.
Tip: Add a dot using a waterproof marker pen when counting the teeth. Start counting at the dot until you have counted them all. This is a practical method to be sure that you are counting correctly.