I have discovered a problem with the turn wheel for raising and lowering the blade on my 3650. I use a height guage to set the height of my blade. When I reach down to tighten the wing nut and lock the height adjustment wheel in place I can actually see the blade lower as much as 1/16" as I tighten the wingnut!!!!! I am careful not to allow the wheel to move but it happens. When I check the height of my blade with the guage, it is in fact lower and I have to reach down with one hand to bump the wheel to get the blade back up to the height I need. I'm holding the guage in my other hand to raise to the correct height. Am I doing something wrong here?