You should be able to get it pretty close.
Just measure the butt end of the shaft with some calipers or a dress makers tape,
then add some build up tape at a consistent overlap and measure again until you
get your desired thickness.
The problem you'll find is the Jumbomax is a thicker grip and the mid size grip will require
a little more effort and solvent to install....will probably feel a little different too.
Worth a try though!
