The experts are correct.
Azusa made the wheels for McCulloch.
When Azusa started making them to sell themselves as Tri Stars, they first added a lip on the outer edge of the rim. but retained the counterbores for the hardware. Then they changed the hardware.
See photo.....
BTW, it took a lot of back-and-forth on the Forum to sort this all out.
The photo of the ad tells the whole story.
Azusa made the wheels for McCulloch.
When Azusa started making them to sell themselves as Tri Stars, they first added a lip on the outer edge of the rim. but retained the counterbores for the hardware. Then they changed the hardware.
See photo.....
BTW, it took a lot of back-and-forth on the Forum to sort this all out.
The photo of the ad tells the whole story.
Jim Waltz, West Sacramento, CA