So the new to me Stihl 028 AV Super needs a new sprocket as far as I can tell.When the chain is tightened to where it should be the bottom guide teeth seem to catch on the sprocket where they seat into it.When loose it will pull through fine.So my question is how hard is it to change a sprocket on one of these.I'm what you would call handy (I guess) I have rebuilt a carb on a walkbehind snowblower and work on a stock car so I'm hoping I can do this but before I start pulling things apart and then end up taking an even more broken saw into the dealer to fix I figured I'd ask around here.