I have never used this place, I don't know if they ship world wide.
graphite storeThis one is supposed to be good also,
graphiteThey do have a link for jerry howell sterling engines pages. It is a supplier to makers of home shop rocket engines.
Another source closer to home maybe a glass working store for beads and glass blowing. As graphite slabs,paddles and rods are used for flattening and shaping the hot glass. They are called marvers
Here is one of the larger hot glass working suppliers, again I don't know if they ship world wide. I have dealt with them for bead making supplies and the safety UV glasses.
wale apparatusThey currently have the rods on sale 3/4"x12 $16.58 USD
Hope this will give you some ideas or help.
Will say that with the limited working I have done with graphite solid and powder. It is messy and will get everywhere. I have only used hand tools, and did it out side might be an idea to machine with a good vacuum near the cutting action if on the lathe,mill etc.
