With a 2-point protractor, align the cartridge perfectly on the outer grid, with the stylus on the correct point.
Move it to the inner grid, moving the protractor, and place the stylus on the correct point.
There are 3 possibilities:
1 - It is perfectly aligned. You are done.
2 - The cartridge angles outward: move it back a bit, and try again.
3 - the cartridge angles inward: move it forward, and try again.
The run-in, between-track, and run-out areas of some records are next to dead silent. On others, they can be quite noisy, even though there may be no noise under the music. The better cartridge would reveal this.
Keep them spinning.