Cab_Burge and polyshperic,

I agree with both of you that the WOT is the bottom most part of the rod, right above it is the cruise circuit. I think the measurement should be done from the top of the rod however since that is where the rod is suspended on the tree. Therefore any rod manufacturing differences, which result in the rod length being different, will always be in relation to where the rod hangs.

Well, I've got a handy assortment of rods here, so measuring out a few with known rod values will eventually get me to the "design spec" of where to measure, worth a try anyways.

Thanks!