1961 Tradewind tongue jack disassembly help needed

[ATurner]

It feels like the grease in my '61 Tradewind's tongue jack has dried up, it is getting stiff and vibrates when cranked but apart from that it still works fine.

Can anyone give me any pointers on how to disassemble it so that it can be cleaned and lubricated please?

There's a domed rivet which forms the pivot for the cranking handle, does that have to come out? If so, any tips for removal/re-fitting so that the jack still looks original and unmolested?

Lastly, apologies... this question must have been asked a thousand times but I can't find anything on the internet, it appears most folks just fit a replacement jack. I just crave originality and would like to do all that I can to keep what I believe to be the original jack in service for the years to come.

Thanks.