I have one of these http://www.dse.co.nz/cgi-bin/dse.storefront/485b70c90c1bd9f0273fc0a87f3b070e/Product/View/M9694 which I purchased new some years ago. 

Naturally, I am now missing the tips and resistors (the little blade fuse looking things which set the voltage) except those which were inserted in it, I'm sure I must have put them somewhere safe and logical, but I do't have a hope in hell of finding them.

Does anybody know where one might purchase replacements from?