i have aquired 3 of these models in nice shape but have been told the bar oilers do not function.is there any one who could tell me how to repare these fine looking vintage echo chain saws.if an oiler gear is required are there any cross references to newer saws for this part as im told there are no parts available any more for this particular model.i have a cs 315 echo would the pump work on a g300f.just trying to get good info on this project before i begin...thankyou joe