Thanks to Student Teacher I have been looking at the ends of the cannon and thinking, "a black dot on the end of this is really going to look crappy." So I have resigned myself to drilling out the ends.(Maybe some people should keep their comments to themselves.)
Anyway, here it is:
I used the 1/16" bit from my DREMEL set..
....and put it into my drill. I have found that I get a great result if I just set the drill on the bench and bring the cannon to it....
....once it is centered I drill it for roughly 5 seconds....
I will be painting these up tonight and posting tomorrow.
Here is where to order the cannon at Brigade Games: