For loading see pictures below - these are for Kokusai M10. There is also a nice loading picture in manual, I will post picture when I find it.
You could put some grease on parts that move: insert that goes into lower part of cartridge, and bottom of cap.
For cleaning do the usual things :-) Head part is a bit tricky, you need to clean the hole and threads carefully. Remember to dry the hole after cleaning, as it likes to keep water inside.
Head part of cartridge used to be reddish copper colour (real look cartridge), but lost it after a year or two of using.