My local Redmax dealer did order me a new GZ4000. He is not a saw man so I need some help. I want a 18" bar ,3/8 lp, that will last. The bar that came on the saw is really soft, painted Redmax. Showing 1/16" nose wear on one tank of gas. Who makes a pro bar for this? Can I get a rim sprocket for it? How much for the sprocket removal tool, extra air filter? Thanks for your help!