Current Recommendations On Home Wheel Alignment Equipment?

Longacre gauge....

When I was younger I used to use one of these (Hunter brand, I think), so I know how those work:

1745573930045.png


You can attach the gauge to the flat spot on the wheel hub or do as I did and make a mount.....

One thing I've noticed in all of the newer gauges posted on this thread is that the lack the spring-loaded needle-like pin that sticks out of the mounting surface, and is used to locate the center of the axle:

1745574115598.png

I always thought that ensuring concentricity was important to getting accurate measurements.
Is there a different way that those other gauges do that?

Thanks,

– Eric