the hydraulic diverter valve is leaking at the push pin. It is the simple "open - close" type, probably original equip made in England, although my 165 is Detroit US made circa 1969. This diverter has always bothered me anyways as the pin gets hit by my foot when I leave tractor seat and accidentally switches on or off during hay work when I need external hydraulics. So, before I order a new one was wondering if there are any words of wisdom for folks that have replaced these before and advice. Is there a drop tube that is a pain, or special O-rings, etc. I need to also buy? Thanks in advance Gents. Finn