Hi, can someone that has or had a b2100hst , 4wd, give me some advice on the power steering break down on how the parts go back together ?. i know where to look at messicks, i can do this, my problem i am having is one of the o-rings # 120 in this break down --> Kubota B2100HSD (Hydrostatic Transmission, 4wd) Parts Diagrams (messicks.com) for H11502 shows me the o-ring, but i see no way of getting the bottom screw part to go down into the cylinder with this o-ring not having any room ?!. what gives ? am i missing something ?.