The grease zerk on the tailwheel housing is a bushing retainer. It is useless for greasing.
Even if it were to grease the shaft, it is impossible for grease to reach the locking mechanism.
To properly maintain your tailwheel, you should disassemble it, clean it, and grease it. Once a year is enough for most RVers.
We have a tech sheet available, free for the asking. It may be useful to the tailwheel flyers out there. Simply send an email to
[email protected] to receive a copy. No strings attached.