Hi Albert,
That is interesting. When I loosen the set-screws at the base of the arm, I can tilt the cylindrical arm post slightly to the left or right. I had thought this was a way to adjust azimuth before tightening the screws again. Then a read a post by dougdeacon that this was not a good idea because the bearing would then not be level if the arm post were not vertical or plumb. That got me thinking that if the arm post is not truely vertical, or plumb, then all the rest of the geometry as the arm swings toward the LP center is not correct either. So now I check for level with a bubble level placed on the flat surface to the arm lock which I assume is perpendicular to the arm post. When it is level, I then retighten the setscrews. Is this slight play in the arm post not normal?
The issue with the VTA screw is that it is off-center from the pivot point so as it is turned clockwise to raise the arm, it exerts a force which tilts the arm slightly to the right as viewed from the front. I then tilt it back by pushing the bottom of the post to the right, moving the top back to the left and making it true vertical again. I thought all SME arms had this slight play at the base.
I now agree with all of those people who say that azimuth is not adjustable on the SME arms because the post has to remain truely vertical or plumb. Fortunately, my PC-1 cantilever is "perfectly" straight and centered in the vertical plane.
This thread is getting off the topic of dynamic vs. static VTF and becoming more about adjusting the SME V arm. Perhaps a topic for another thread. Sorry.
