... I'm not the 66 guru but could it be it has self adjusting and the hole was deleted??.... but heck, even on self adjusters I've seen have a hole in the back.
I'm watching to learn something myself!! (when was first year for self adjusters?)


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile