Trying not to sound negative, I would not do that to my Plumb (or an Estwing) or my very old Ausie light hammer or even my knock around relatively new stanley (used on really rough work or when workingsomewhere where someone else might need it more than me as with my original Plumb). I do not see the point & if it were to start a drive of very small nails/tacs that would be different and fortunately those jobs are very seldom so using magnitised needle nosed pliars works for me.

I've seen a log of folk ( even carpenters) choke the hammer to about the length of that shortie which lengthens driving time due to the reduced power of the shorter length grip and in that softwood it really would not matter.

Not for me but some might like the idea.

cheers