Don,t really know the gear but I wonder about "partial rebuild".
To me a rebuild should be a rebuild.
I have read that the pressure regulator spring should be replaced with new, not reused.
Also the guy who wrote about his re,re said the rebuilds replaced with a higher pressure spring, not a lot but higher.
No idea now although I may have bookmarked it at home. Send me a pm and remind me and I will check when at home in a few days.
Worn parts may cause excess leakage internally.
Pressure guages should be mechanical, good quality.
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