I recommend our forum members to check out two articles on the Butterfly knives and the Dragon Pole at this link:
http://garylamwingchun.com/articles.html
They discuss in details concerning the WC weapon training methodologies as well as many interesting insights, usage, and purposes in the modern era. Everytime I reread them I see something new. This will flesh out nicely with what David and Rene discussed above. Have fun!
Regards,