I have an early Type 1 and like many of the older Curtas, it's missing the black caps that originally covered the slider pins. So I made some new caps and haves extras that I'm selling on eBay in case anyone else wants them too.

They're made from black-dyed nylon. Here's the eBay link: http://ebay.us/PUgLBy?cmpnId=5338273189