As a Conway Stewart fan I'm not sure what the view in the Waterman section is on hard rubber, I find it a fascinating material and Waterman seem to have been the most imagiinative users.
The link to an item on the dreaded here went for an awful amount of money for a pen and pencil (and way out of my league) but a wonderful set.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...A:IT&ih=009
Desirable as it is, I think I'd be frightened to go near it let alone use it!
Greg