Hi, look at 354 PTO link below.
The 354 has same PTO as your 384, look at the post from damojordan with the parts photo with the PTO engagement lever, Item #4 has a roll pin that engages into Item #5 collar that connects the rear PTO shaft to the front PTO shaft that is driven by the PTO clutch. If the roll pin on Item #4 gets sheared off then you cannot engage the PTO. The roll pin can be replaced by remove the 3 bolts on Item #3 and pulling the PTO engage lever out. It takes some luck and feel to get the PTO engagement lever and pin re-installed in the collar.