What pencils have a “double clutch”?

[speedfreek]

But the idea is that a second lead helps the first lead get fully used up?

[First_Sail]

Well, but it happens with many pencils without a double clutch; a Tikky can do that, for example.

[Leonov]

After finding a Pilot Clutch Point by chance, I became quite interested in the double clutch technology, and later got a Protti PRD105; I have to say that, given the rubberised grip on the Pilot, I generally prefer the Protti, even if I had hoped for a slightly lighter pencil — the Protti tends to be a bit on the heavy side, at least for my taste.

I wondered for a while whether it was possible to relocate the internals of the Protti into a different pencil with a lighter barrel and grip area, but I think the heaviest part is a single bloc, and cannot be disassembled to the point of being recycled into a different for factor.

Still, a great innovation for writing/notetaking pencils; impossible to carry over to drafting models, I am afraid, but nonetheless an impressive achievement.

[First_Sail]

It can be easily disassembled up to this point, check yours.

[Leonov]

Amazing! I will be experimenting with screw threads combinations, looking for possible lighter alternatives. Thanks @First_Sail !

[speedfreek]

Looks like the cone and front part of the grip could be fitted to ”any straight tube” kind of body with a bit of irreversible violence and glue.

[First_Sail]

For now, the Protti’s internals are fully compatible with the Penac Pepe’s body; it even accepts both eraser caps. Here with the Protti cap. It looks better, but it sits a bit high and separate from the inner walls of the body. The silver Pepe cap fits better. In the image, you can see the Pepe’s mechanism with its silver cone.

Well, I’m just scribbling here, and honestly, it does improve the overall feel. The Protti’s cone is slightly shorter than the Pepe’s, which I think it feels better and more solid. The thing about the Protti is that strange combination of features that puts it out of any recognizable category: it has a knurled grip along with a conical, cushioned sleeve. It’s not ideal for writing because of the grip, but that sleeve makes it unsuitable for drawing lines with a ruler.