Well i've been reading about modding the g13 and i really did not want to have to open up the g13 and or sand down joysticks etc. and also void my warrenty. I came up with a solution not sure if anyone has done it yet but i like it so far and it actually looks like it came like this from the factory. all you have to have is a drill, drill bit, xbox 360 thumb stick, glue gun, and a thumb grip that slides over the xbox 360 thumb stick.
all the pics are in sequence, this was after i did mine, i just wanted to show the steps to do it so the pics are a little sloppy but i just wanted you to get the idea...what i did not put a pic of is actually sliding it over the joystick on g13... i filled the hole up half way with hot glue and then slid it over the joystick and put the bottom of the xbox thumbstick even with the bottom of the g13 thumb stick... you cant slide it all the way over then the new thumbstick will restrict you... as long as its even it looks very nice and looks factory.. now you have better grip and much nicer looking g13 without having to take the g13 apart...any questions or need more descriptive answer on anything let me know...