I have a vague idea that the accepted trick is to drill a few holes in the stump (presumably in what was the sapwood outer edge), pour in some Roundup and plug the holes but I am extremely hazy on the detail and a quick google hasn't helped.
I have some commercial strength glyphosate (360gm/l) so:
How much do I need to dilute it to turn it into stump killer?
How much dilute solution is needed to kill a moderate sized stump - say 6" diameter?
And what is the best time of the year for the application? I appreciate that it is now too late in the season to do anything worthwhile this year.