Honda-SOHC

The paint on this casing  on my F2 is looking really dull as it is everywhere else. I seem to see different approaches to this casing on internett images and even the cover of the Haynes manual. Should this item be polished as opposed to painted, does it respond especially well?

 I recently had a new harness (loom) fitted and new battery too. I soon needed a new rectifier and that was done. Then a black out on the street that turned out to be a couple of blown fuses, something the AA man overlooked    , my local bike shop sorted that out. A new condenser has been ordered as I saw a one on ebay. So I'm working on my electrics but not fast enough it seems. This morning all was dark when I turned the key. I noticed my headlamp switch was in the on position from when I last rode a couple of nights ago, I didn't see that doing any harm but took my battery in for a check in case, all was well with that.
I take off the side panel over the fuse box area and gave this tiny black square thing (arrowed in picture) a good press with the finger and all lit up fine. voom voom off I go.  Next time I try to start the bike down town all was dark again. Pushing and pressing the same thing didn't help this time, so I go to check the fuses, I took out the lower most one, it looked fine, put it back in and all lit up again. When I get home I experiment a bit and find that taking out that little black square didn't make the bike go dark ...so what happened his morning. What could be causing this. Is changing the fuse assembly a good idea or should the next move be something else?

My front brake is capable of squeaking loud enough to have people looking at me funny sometimes, I bet I'm not going to oil them but what can I do, why does this happen if it's not at the disc?

I'm about to fit the oil drain tube I've acquired that goes into breather collector box that goes under the air box.  It came with a sponge in the wide end, I'm not sure this stays in or is just part of the packaging....ding dong ...?

What was the CB400F2K1? I see it on this site but nowhere else.... https://www.howmanyleft.co.uk/vehicle/honda_cb400f2k1
They get the stats from DOT ,, this could interest some of us... https://www.howmanyleft.co.uk/?utf8=%E2%9C%93&q=honda+cb400f2 ...and.. https://www.howmanyleft.co.uk/vehicle/honda_cb400fi

I'm soon to lift the rocker cover on my CB400F2 for polishing and have purchased a new gasket/packing for it ahead of that. I see it is of the rubber tube type that will fit into a groove. Do I need any sealant for this item. I have Loctite Flange sealant MR5922 handy.

I just got a black metal number plate through the post for my CB400F2 and stuff the law lol. But it's got no fittings, is this going to be difficult or is there an easy way? My bike is at this time in a workshop having things done...