Recalibrating the distributor.

After checking with a couple of shops to see if they have a distributor machine and getting "blank looks", I found one that has the machine and lots of springs for the weights. Mine is missing one of the springs on the centrifugal weights. The older gentlemen said to bring it in and for $35 to $50 he will get the weights back to factory specs. My 65 shop manual shows the timing advances at the various distributor rpms for my exact numbered distributor. I made a copy of this and will give this to the shop to follow. In everyone's experience, is this the best route to follow?