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I'll bet you are onto something. I am BY FAR not an expert, but it makes sense that if the lower O-ring was leaking, the HH would drain. One other thing that I've picked up on in the forums is that a leaky plunger could cause you to "gain oil". Hope that isn't the case. Good luck.

I won't try to diagnose the drip problem, it could be the fuel control rod O-ring. This has been stated as being a -013 O-ring, usually widely available in many different materials. That's what I used, in Buna-N rubber. As far as the 3 O-rings: HH Upper 2.484 ID x .139 -230 HH Lower 2.109 ID x...

I can tell you from experience that the line, or red tooth, on the HH driven gear, shown in Gimpy's photo (not the IP timing mark) needs to be EXACTLY lined up with the pointer, or you will pooch the stamped piece covering the drive gear that seems to be intended to keep you from screwing this...