Nose strut access panel
Late to the party here, but I recently serviced my nose strut on my '77 NA G model and found that there is an access/inspection panel just behind the nose gear door on the aircraft belly. It's not a large hole, and you have to unbolt the lower door to get the panel off, but it is large enough to get a wrench and hose etc in there and makes replacing the valve stem, valve core, and strut servicing a little easier than going through the front side.
-YMMV-
--LJ
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