I just came in possession of an older Stihl string trimmer. The bezel over the pull start says it's a FS 90 AV Electronic. Presently, it fires but does not start. The previous owner mentioned that it ran well until it was put into storage a couple of years ago and a carb rebuild kit is probably all it needs. The unit is literally built like a tank... In many ways better than the new Stihl models. It's practically all steel and with very little plastic. Cosmetically it looks excellent for what's most likely a ~20 year old machine (I suspect that it saw no commercial use). Even the warning labels on the shaft are still clearly legible. I need to get the engine going and I want to replace what looks like an early model polycut head with a string head. That would also require a new deflector with a cutting blade on it, correct? If I can still get parts for it and get it running I'll ditch my Ryobi but I'm wondering if it's worth the effort and the $$$ to get it operational. Am I nuts?