I did see on the Green a few weeks back someone made a t-handle bolt for their M-Rod. When worked as left handed, you had to push it up, instead of down:
http://www.network54.com/Forum/275684/thread/1334304238/My+new+.25+Mrod%21
Looks a bit easier than going at the bolt with a mill.
Good Luck!
Sam
Disco(s) .25 ~ .22 ~ .22 Pistol
Sam
Disco(s) .25 ~ .22 ~ .22 Pistol