Got a 2 stroke ht 66cc. Ive noticed that on my stock pulley the chain has "eaten" into it to make its own grooves. As I adjust the pulley it will make the chain run erratically untill it seats itself onto its new groove. Has anyone made a billet pulley in place of the factory nylon one. Not interested in anything plastic unless you have tried both and can show the difference and improvement in one or the other.