Wobble in wheeels

[ajgetsthebag]

So i have a revo 3.3 and it came with 17mm hex and i swapped it to 14mm hex to install the t max stock wheels and when installed when i drive the wheels wobble. Any suggestions?
I was thinking of adding a washer

 

[gotnitro]

Ah what the hell..

Yeah give that a go and come back with some pics..