I have been using a tip that I read about years ago on Audiogon for leveling the headshell. (making it parallel to the record surface.)
Find a set of 3x5 cards that have the lines printed on them.
Look through them and find one with perfectly parallel lines. (very easy to see if you look near the edges)
Take that card and carefully fold it in half with a good tight crease so it is a long "V" with the lines on the outside.
With the platter stopped, carefully lower your stylus down to a nice flat record on about the 2nd track.
Place the card (upside down V)on the record behind the arm & cartridge so that the card is on the flat part of the record (away from the label and the outside edge)
Now use a flashlight and look at the headshell and the card right behind it. You will easily see the top of the headshell against the lines of the card - it is very easy to see if it is off parallel.
Now adjust your VTA on the Triplanar exactly.
(The headshell on the Triplanar is installed exactly parallel to its arm.)
This is the best method I have found to start off with a parallel headshell on the Triplanar.
I think you will like it as much as I do.
(I keep the card in my kit)
Have Fun,
Joe