So has anyone here cleaned out their expansion valve only to end up with a leaking O-ring? I'm a mechanic and work on hydraulics on a daily basis. I must have spent 2hrs trying to re-assemble the valve with a new o-ring with zero success. The fit is tight and there is no taper to allow the o-ring a smooth transition into the housing. I greased, picked, prayed, cried, danced, etc. Does anyone have any information that could aid in getting this assembled without leaking? I have a spare core but it has been sitting for years taped up and defeats the original purpose of taking the valve apart to clean it.