Here’s a couple of older Klimax models I picked up. The busted one I bought specifically to disassemble to see how it worked, as I love how innovative and excellent the operation is. The inner copper leaves cut from two outer layers of the inner barrels allow you to see some of how precisely the more ‘sticky’ copper is use to pull and push the tip out. It’s really quite ingenious how the ratchet trombone action catches the barrel with one push then releases it with a second, whilst twisting the button at the tail extends the lead in a traditional twist advance motion. I’ve seen adverts from the 1880s for these.
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