Almost done with this saw! Been fun so far. Only part I have left is the metal fitting for the oil tank between the oil line and the duckbill valve. I've come up with two different part numbers. One looks like a solid brass fitting and the other is a sintered fitting. Not sure what the purpose would be? This is the line that creates pressure in the oil tank. Anyone know if I can just use a solid metal connection to join the duckbill valve and hose?