Before disassembling parts that have critical alignment, it is very wise to carefully note the orientation as a quide to proper realignment during reassembly. Generally there are no accurate landmarks for reference. Scribing a very fine line, known as a witness mark, across the joint between the parts, an excellent reference can be produced. It should be used on drivers mounted on splined axle ends or can motor bells and barrels, when replacing brushes.
In some less critical cases a sharp pencil will do, if it will mark. But this is succeptible to rubbing off. A more permanent line can be scribed with a very sharp, carbide or diamond tipped scriber using a straight edge as a guide. In a good many cases, the line many not be easily visible on the surfaces. Simply apply, easily removed, DYKEM or other darkening agent (paint). Let dry and then scribe the line across joint. Some people claim, they have successfully replaced drivers, sans quartering jig, using these marks. They can save much agrevation and time consuming trial and error alignment and more possibly lack of success, when replacing can motor brushes.
Witness mark scribed to the right of axle center across driver hub and axle end.
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