I have a Pentel GraphGear 1000 0.3mm pencil, which I’d filled with Pilot Eno 2B leads, because I get on better with softer lead. The problem was that it wore down very quickly. I couldn’t use it for taking notes at work, because I’d have to stop to click more lead out three or more times when writing down an address.
Today, I finally got around to trying it out with Pentel AIN HB grade lead, and it’s much better. Yes, the line isn’t as dark, so it’s not quite as easy to read, but I can write several lines between clicks.