RE: Official Rules.
Everything gets 4 "H" measurements per side. On the 4 point side you measure between the burr and the g-1 (always the smallest measurement), the g-1 and the g-2, the g-2 and the g-3 then half the distance from the center of the g-3 to the tip of the main beam.
On the 3 point side, everything is the same but I think that you measure from the center of the g-2 to the tip of the main beam . Take that measurement and divide by 3 and take the H-3 and H-4 measurements that distance apart, starting from the center of the g-2.
Ex. If the measurement from the center of the g-2 to the tip of the main beam is 9".
9/3 = 3, so 3" from the center of the g-2 is where you take the H-3 measurement and 3" past the H-3 measurement is where you take the H-4 measurement.