Azimuth "recording"

@lewm , of course crosstalk is a problem with mono cartridges. Mahgister will tell you it is between the positive and negative pins:-)

@chakster , This is off topic but I was just given a pile of old 78 RPM records. Do you have any recommendations for a 78 RPM mono cartridge? I have no idea what to get, just stabbing in the dark.

@lewm , sure you are:-) But, you have to ignore millercarbon. He always says the same things which means he has nothing to say. 
The OP wants a quick way to set azimuth without marking up his beautiful tonearm. All he has to do is make a few wooden gauges and he is good to go.

I absolutely side wide lewm and elliot on this. The most important issues are tracking and record wear. If the cartridge is constructed correctly this will match up perfectly with cross talk results. The mirror trick Elliot mentioned is a great way to make any deviation from vertical obvious. The SmarTractor adds to this by adding a magnifying system which really makes setting azimuth child play. As for being able to quickly repeat the settings, what I think you will need to do is make a protractor for each cartridge. I would use 1/4" plywood. As an example for simplicities sake lets consider a Koetsu which has a perfectly square front. You would set it's azimuth by mirror then take a piece of plywood 3" long and as wide as the Koetsu is high sitting on a record say 3/4". Then you would trim the 3/4" edge to match the angle the front side of the Koetsu makes with the record which ideally should be 90 degrees. You would have to use the protractor gauge you have made with the stylus sitting in the run out groove so your protractor does run over the elevated lip of the record which would change the angle. You would make a label a protractor gauge for each cartridge using what ever surface or angle of the cartridge you can reliably replicate. You could make a protractor for the upper surface of the head shell which is usually flat.