Here is a 4Point headshell with Wally VTA attached.
View attachment 47389
- You can see why a small bubble level can not work. There's no flat spot to put it.
Wally VTA
- Mount a cartridge, place it on a record, then measure the height to the underside of the headshell with a supplied scale. I do this once for each cartridge and write that down in my notes for it.
- The Wally VTA has shims of various thickness: .25mm, .50mm, etc. It's default height is 16.0mm. Add shims to equal the measure height of the cartridge.
- Rest the long blade of the W/VTA on the record and adjust arm height until the blade is perfectly flat on the record.
- Result: Tonearm/headshell bottom is perfectly level to the record.
From there I adjust arm height to assure equal amount of space, up and down, for adjusting VTA. There is a height gauge on the side of the 4P's VTA tower. I set the 'arm height to the middle marker on the gauge. I don't mind if you think this is less simple than eyeballing.
I know a guy who uses a laser level to set the 'arm parallel.
I guess I can visualize why the armboard height is relevant as it
may apply to the 'arms height position as pertains to a starting point for SRA setting and possibly the amount of up-down space available for that. The 4P has a long shaft on its VTA tower that allows the 'arm to be moved up and down. If that shaft were short, armboard height could be critical. Thanks for the lesson!