Nakajima Ki-201

[scautomoton]

Interesting to know, thanks Jon. 
Might have to look for one or two.

They are not exactly cheap, but as Jon said, they are easier to clean than normal files.

Oh yes, I use an old toothbrush under the tap and it comes up like brand new every time. 

Also, for small parts I lay it on the table and gently drag them across, makes it easy to get nice flat surface planes. It's how I did the wing joints on the Thin Wing Javelin.

[Gondor]

I have managed to make some progress with this build. PSR has been performed on the wing/engine assembly and the fuselage assembly. The latter required more putty, and the lead I put in the nose rattled a bit when I was handling the fuselage. This was cured by stuffing some Plastacine in through where the wings attach and into the nose area. As I was quite happy with the wing/engine assembly, it has been given a scrub under a warm tap with an old toothbrush and is now drying. I should be able to give it a coat of primer tomorrow, the fuselage will get a coat of primer on Tuesday if everything goes well.