A postable wood kitless pen that doesn't scratch the wood on the barrel?

[cjenkins]

Hi all, I am wanting to make a wooden kitless pen that posts. The problem with this is, in order to hold a thread, the material on the inside of the cap needs to be harder than wood or stabilised wood (I think?). So when you try to post the cap, it will scratch the wood over time. I thought of a potential solution to this - have the threads on the section be by the nib instead of the usual place, so that the associated cap threads can be deeper in the cap. Then, have the first half of the cap be lined with a softer material (rubber?) that won't scratch the wood when you try to post the cap. And have the second half of the cap (the deeper part of the cap where the nib goes) be the harder material that can hold a thread. Like this picture. (Pardon the sketching, I'm not exactly the best artist.) Does anyone notice any immediate problems with this? Has a better/easier solution been done? Trying to potentially save a lot of time trying to make custom threads.

(Edit: I noticed that the pen I drew can't post, the cap is the same size as the barrel. I meant for a pen whose barrel is tapered)

 

[darrin1200]

I personally, don't design my to post.

The problem I foresee, is the eventual size of your cap.
For a #6 nib, your inner cap will have to have a minimum of 11mm threads, which means your plug will be at least 12mm. Your main hole through the cap will need to be drilled at 13mm if your rubber is 1mm thick.
Then it will need to figure out how much wood you need to be solid. I would guess 2mm thick.
This will give your cap a 17mm diameter.

This is one of the reasons that sleeves of "plastic" are generally used. Because the plastic I'd harder, the wood/plastic can be thinner.

 

[Penchant 4]

Good luck!

Think cap drilling would need to be 14mm, if the rubber is 1mm. Maybe I misunderstood