I have a Stihl 028 Super that is getting hard to adjust chain tension. Turn it 4-6 times before I get any movement. I am sure the adjustment screw is stripping out and needs replacement. I have seen the replacement parts on e-bay. My question is is this something that is fairly easy to change out or should it go into a Stihl dealer to have it done? Any one have experience or tips on doing this? I have only done a little simple maintenance on my saw before. Let me know what you think would be best route to take. Thanks!