I swear I saw a thread somewhere that had an idea about using graphite pencil leads for making scale O scale nail heads in wood. But, can't find it. If I remember right, the smallest size on the thread was .5mm (?), and the author thought smaller was available. I have since been anxious to use the technique.
So, I found some pencil leads in the .4, .3 and .2mm sizes (good golly, these are small). The .2 mm works out to about 5/8" in HO, a real size of .007". It sounds like it would be perfect for HO scale, let alone a more perfect size for O scale.
The web site I found them available is
http://www.jetpens.com/Pentel-Stein-Enhanced-Silica-Pencil-Lead-0.2-mm-B/pd/11967 although I am sure others are out there.
with the lead made by Pentel. (Pentel Stein Enhanced Silica Pencil Lead - 0.2 mm -

You can even get a pencil to use them, making it easy to dispatch the lead. One question, which lead (B or HB) would show better?
Hope this is helpful to many.


Tony Burgess
Comments
John
Tony
HB is medium and used in most general pencil applications. B is softer and I would presume creates more powdering and therefor smudging as it will dis-integrate easier to powder. H is harder and more brittle.
I generally add the nails this way after everything else is pretty much done. In O scale I like them (when I get them right) in moderation. In HO they are very easy to become overwhelming, as with any other method.
Karl.A
Tony
They were also square, not round. Now I think we have a prototype for the large nails that we can use.
Those 1/2" nails would be about the same size as the .2mm in HO scale. So they might work after all.
Tony
By the way, I got my pencils and lead in a few days ago and hopefully I will get a opportunity to try it out on a few spots. I bought both the .2 and .3mm leads.
Tony
John
Rich