Originally Posted by saevel25
It will be tough to get that distance off just by shortening it. Also you will make the club play very lighter than it normally is, and make the club more upright as well.
Honestly the best course would probably go buy a 20-21 degree hybrid.
I think you mean it makes the club flatter? Shortening the club would require you to move the butt closer to your body and point the handle more towards the sky at address like a wedge, not angle it lower like a driver. If the toe is pointed too far up at address, shortening the club would make it play flatter and fit better for him. It has a lie angle more like one of his long irons rather than his woods so it needs to be closer to that length to fit his profile.
It will require about 6 grams of additional weight per half inch you remove to keep the swingweight constant, 2 grams is about one SW point and a half inch is 3 SW points. Either lead tape or adjusting the weight screw should work should you choose to go this route, you'd just need a grit edge blade to trim the shaft if it's graphite after removing the grip, then just fix the weight and regrip. If you wanted to reverse this job you could use butt extensions and you'd have to regrip it again. Shouldn't do too much to stiffness unless you forget to add the weight or you trim the tip instead of the butt for some reason. 40.5 inches doesn't seem like too long to me though, it should be within mortal means to hit compared to other hybrids or woods of this loft.
Another option, though one I wouldn't recommend, would be to reshaft the hybrid with a heavier shaft, possibly even steel like the KBS hybrid or dynamic gold SL, and shorten it to make the weighting work out for whichever shaft you pick. It would take at least 10 yards off in theory, but will make the club play differently; it would take off ball speed while probably lowering launch, so your trajectory wouldn't be high enough to be ideal for a hybrid. It would be a bit cheaper to buy and install a shaft than add a club, that's the only reason I mention it.
In my opinion, I think shortening it could help a bit but I agree with @saevel25 that it wouldn't be quite enough on its own to change your distance that much. You have a fair sized gap at about the 3 iron slot, if you don't carry a driver then something at the 20 degree loft will probably fit into the bag, or you could even track down a 3 iron from your set though it is fairly low lofted at 19 degrees, but due to the shaft length it would probably gap fairly well. I wouldn't mess with the club if you like it, but you have a loft gap of 4 degrees and a length gap of about 1.5 inches if I'm reading correctly. You could also drop a long iron and fill the 3 and 4 spots with one hybrid, if you feel you hit it better than a 4 iron. It's easier to hit a choked down hybrid off the deck than a full 3 iron with only 1 degree of extra loft.