This is more of a question for experienced builders/fitters, than it is a suggestion for Hoss.
Couldn't Hoss use lead tape straddling the balance point of the club to mimic the heavier shaft? This wouldn't be perfect, but I would think it would give a sense of the effect of the added weight.
For example, let's assume the following to do a sample calculation:
- the raw (uncut) shafts are 41 inches
- the bottom of bore to ground measurement is 1"
- the 5-iron is 38" (so that the cut shaft is 37" -- okay a bit less because of the grip cap, but this is just a rough experiment anyways)
- the iron lengths progress by 1/2"
- lead tape is 2 g / inch
(Hoss would have to do the actual calculation based on his actual numbers.)
Based on the above numbers, the 100 g shafts weigh about 2.44 g / inch and the 130 g shafts weigh about 3.17 g / inch. So, the 37" cut 100 g shaft weighs about 90.2 g and the 130 g shaft at 37" weighs 117.3 g. So, to mimic the weight of a 5 iron with a 130 gram shaft, Hoss would add a total of about just over 27 grams of weight, or about 13.54 inches of lead tape. I would add roughly two 6.8" strips, one strip on each side of the shaft", with both straddling the iron's balance point.
Would this work?
If this would work, Hoss could do the same with the other irons, using the following lengths of lead strips:
6 -- 2 x 6.7"
7 -- 2 x 6.6"
8 -- 2 x 6.5"
9 -- 2 x 6.4"
Or, since this is just a rough experiment, put use two 6.6" strips and just interchange them on each club to get a sense of the effect. Again, I would wait to hear from someone more experienced than me before trying this.