I own a Stihl 029 saw and have had it for years, I have bent the guide bar and I am looking online for a new one. I want to upgrade from the Stihl bar to another one (mainly because Stihl bars are stupid high and i can get a better bar for the same price) anyway my problem is the saw web sites are asking for the chain guage of either .063 or .050. First of all what is the chain guage and secondly what is a stihl blades guage? I have never bent a bar so i have never had to worry about it so please excuse my ignorance.