I received the following message from Caleb:

Hi, great blog such a great resource, thank you for this!

I just recently acquired a Rondinax 35U in a box of old darkroom equipment.
However I notice it is missing the film guide ‘tongue’. After seeing a few blog posts about 3D printing, may I propose something to you?

If you can get a tongue to me then I will be more than willing to attempt to make a 3D model of it and get it printed (and will provide for others) if it works out.

I reside in Australia, get back to me if you are willing to support.

Any takers? One in Australia would be ideal.