I'm getting a bit closer... here are movement diagrams: http://www.horomundi...read.php?t=4725
AH HA! FOUND IT:
http://www.timezone..../horologium0033
Bam!
"Following the service, regulation with the Triovis (Triovis! That's the word!! -S) adjuster and movable stud carrier was carried out. As show at left, gross adjustments of rate are made by moving the regulator itself (red arrows). Very fine rate adjustments are made by turning the Triovis screw (at the orange arrow), which moves the regulator in very fine increments. Beat is adjusted by moving the stud carrier (blue arrows), which shifts the outer attachment of the spring. Following service, regulation of rate and beat produced the following figures."
So I know you don't wanna mess with the beat... you'll probably just need the Triovis...
See the picture midway down!