John from Cle Elum
At some point a decision will have to be made.
What is a "used-on" list you may ask? It is term used in the aerospace (among others) industry. If you are handed a part, you can go the list and find which aircraft was it used on. It makes it easy to find bone-yard parts for reuse. Stihl probably has something equivalent but it may be called something different. I am trying to find which chain saw(s) a 4138 007 1008 fits (its a tank guard). I suspect it is interchangeable with a 4138 007 1003 but I want to verify.