Originally Posted by pizzaboy192

One thing I've used is chewed chewing gum. Some of the stuff that is "long lasting" or known for not turning to chalk after chewing it after a few minutes. It'll get pliable with heat, but isn't goopy, and isn't 100% solid when colliding with other objects on the track.

Did this successfully with my M03 and a new diff. I don't race much, but it did lock it up very well. Had good success with Trident brand (Because that is what my wife chews)