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Default Brake adjustment on Lagun mill

Hi guys! How the heck are ya? Did ya miss me? LMAO
I still lurk all the time, just don't post much, 'cause... well...
umm... by the time I read the posts, someone usually already has said
the same as I would.
Knowing that there is a LOT of talent in here, I have a problem and I
need a little help.
At work, we have a Lagun mill, model fu2-lac. At one time, someone
locked the spindle brake and forgot to release it before running. (I
know, I know, I don't understand it, 'cause it has an air chuck, but it
happens). I had a few minutes recently, and thought I'd adjust the
brake, but for the life of me, I can't see how. The brake is just a
lever to a eccentric pin that throws the shoes against the inside of
the lower half of the variable sheave. Just like a drum brake.
The shoes appear to have plenty of material on them, so I can't
believe the sheave itself (which looks like pot metal) is worn. I also
can't believe you would have to remove the motor, bearings and sheaves
to adjust the brake.
As I'm writing this, I'm beginning to wonder if the adjustment screw
and jamnut located on the top of the head midway between the motor and
spindle might be linked to the brake. Admittedly, I couldn't see what
it adjusts because the belt is in the way, and didn't check it with an
inspection mirror. Good thing I didn't start tweaking it before I know
what it does! LOL
Anyhow, if anyone has any experience on Laguns, could you point me in
the right direction?
I'll screw it up from there.....
Once again, Thank You.

Ron