Custom Swing Weight at E-0!?!?

Joined
May 15, 2019
HCP
6
Local club/country
United States
Irons
Callaway Apex Pro 16 4-Pw
Driver
Callaway Epic Flash Sub Zero 9 degrees
#1
My dad has a set of Mizuno JPX 850 Forged, and he had a problem getting the ball airborne. He swapped out his 125 gram shafts for 105 gram shafts and made zero difference.

He went to Club Champion and got custom fit for a shaft. Turns out his irons had an E-0 swing weight with the 105 gram shafts. This cannot be normal.

We were wondering if the heads have a weight plug in them to make them that heavy. Any help would be appreciated.
 
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