Accel Dual Point Distributor Question

I have a small block Accel dual point distributor. It appears that you can limit
the mechanical advance by moving a small allen screw to different threaded holes that are located under the breaker plate. Is this correct?
If so does anyone know what the degrees limit is for each location?
Hello 694spd,
Hope this may May help.
Stay Safe.....
Happy Mopar :)
Arron
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