I got this saw from an uncle that had no need for it. The problem I have with it is that it cuts a curve in a piece of wood and can't seem to get it to go away. The bar is straight and the grooves are true. I have 2 chains for the saw and both chains ill also cut in a curve. This points me back to the bar. It is the original bar that came with it,not after market. Is there something I should do or just get another bar? Any suggestions if so? This saw did cut good and still runs strong. (20" bar)