I have recently found the need to adjust Zenith by small repeatable increments and it seems that hot glueing a laser to the side of the cartridge proves to be quite effective.
The need for this type of repeatable precision was so I can plot the change of IMD against Zenith angle and the results are telling.
If you want all of the sordid details have a look at the link below.
http://www.intactaudio.com/forum/viewtopic.php?t=1660
and for an update on some old dirty laundry check this out:
dave
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