can anyone recommend a person in LA area to pay to install a tricky Koetsu cartridge

Whoever does the setup needs to see the diagram of the interior of the Omega arm, which is pictured on the card supplied for locating the hole for mounting. The bearing is offset from the center of the mounting hole, and affects the arm's effective length/pivot-to-stylus distance. Unless the Mint protractor is made with that information, it will not be capable of providing accurate alignment.

Mulveling is right. Get a cheap cartridge to practice on.

I have a KRSP too. It’s harder to install because the cantilever is hard to see, but it’s also easier in that the body is rectangular, and so the orientation of the cantilever can be inferred. Also, as noted above, the stylus guard is tricky - you might want to practice that with the cartridge rigidly mounted.

Also, with such a wonderful cartridge, it makes sense to get it absolutely right. To that end, I use a torque screwdriver, micro bubble level, and callipers to make sure that measurements are exactly right.

Good luck!

thanks for all the information I am psyched to hear the Koetsu.

I found a guy David locally who has done lot of cart setups for a local hifi shop though not my arm or cartridge or TT.....I do have the manual for the helius arm and the only trick with the TT is that the arm has to travel through the trough smoothly not hitting the bottom or the sides.  If all goes well will get it installed next week.  I will try to have my usual guy avail telephonically (as he especially needs to remain in quarantine because of health issue) if a question arises.  Unfortunately the helius is not VTA on the fly...need loosen a set screw but in a way perhaps better because this way I am not less inclined to fuss with it once I am happy with the sound.  

IF it sounds awesome roll with new guy, otherwise be forewarned and get a revisit with Randy or Brian, both analog zen masters

Call Scott Walker audio in Anaheim. They can put you in contact with the best