Gday Merlin
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As a matter of academic interest, how do you set up the fork mount level on the tripod/ bench when measuring the Dec heights?
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I also use a similar method to Barry
The base doesnt need to be level, as long as the base of the scope
and the support holding the micrometer doesn't move.
You need to do a minimum of 4 measurements to get a correct value
but multiples are better.
Basically, I set up my extensions then point my OTA vertical
I measure the max value for the tops of the extensions
by rotating the RA 180deg
I then rotate the OTA to vertical down ( ie i move dec by 180deg )
Then repeat the process
You then average the readings for each side to get the correct delta
This eliminates any need to get the base level, or the extensions perfectly concentric to the axles.
Andrew