Manu from l'Equipe introduce me to the "big grip" thing, he's playing Tennis and he love having pretty big thing in his hand (yes haha). Basically he want to have a tennis handle on his mallet.
Tennis racquet are made to be handle with one or two hands, the handle is almost square.
The rule think, and manu will correct me, is that your fingers can barely touch the palm of your hand when holding the handle.
I'm in this, i like having something to hold firmly, something that will absorb in some way the vibrations.
I know some people, like greg from CMD, who likes using golf grip, i can't.
I have pretty big hands and im feeling too tense when the handle is to small.
That being said i have started to mimic a tennis handle, the tricky part is to find a good material to have the same square shape, here's some pictures:
(The material used here is not that good, the cardboard will became pretty round when putting the tube around)