Because my post barn has three bays & I wear't very own horses, my theory is that I'm intended to have one tractor per bay! The governor has a lengthy screw and a short screw; make sure that you place the short bolt on the top. Now to mount the pistons, it appeared like it must be very easy adequate: oil up the cylindrical tube bore and piston, pop on the ring compressor and port that piston right into the opening! Yes? Well, it didn't go in this way.