yup, already did. the formula is the distance between center pins devided by deflection in inches. so if my tester uses 26 inches on center between pins, a two pound weight, and my dial indicator reads .26 of deflection, the formula should look like this... 26/.26 = 100 pounds.
so it seems that folks are trying to find a dozen woodies that will spine up the same. so here is a thought. we know the static spine changes as we spin the shaft in the tester. grain vertical is stiffer than grain horizontal. so if we have a dozen shafts that are close in natural spine weight to what we want, cant we spin them till they deflect the same dial reading as the weakest in the group. and as they dial up to what we want mark the shafts and install the nocks according to marks. so we are fine tuning our spines to be the exact same within this group my "clocking" our nock/string/shaft grain position. shouldn't be too hard to do, there are lots of arrows flyin around where the builder never considered grain orientation when he installed the nocks!