Having trouble maintaining correct pitch when sharpening chain. Have a hand sharpener( Husky) that holds round file and a flat file for rakers.Trouble is I am right handed and when I sharpen I always seems to have trouble maintaining even sharpening from right to left. Also angle is maintained by eye as you go. Years ago I had a sharpener that mounted to bar, set the angle and height of round file and it worked great. Rakers were done seperately with a flat file. Anyone know where I can get one or anyone using something that works well. thanks in advance.