You´re welcome,Paul.
Another small tip when using a pencil for the blank metal surface: When using it for a greater number of surfaces or even tracks,i take a piece of fine sanding paper and grind the pencil lead on it,so i get graphite powder and distribute it with just a fingertip.I did that on the sprockets on my 1/16th Luchs lately and it works quite well.A fingertip can adjust very well to surfaces and edges...

Or you could use a sponge brush for that.