See the Morris magneto retard advance lever at:
http://morrismagneto.com/?product=mra-g
Be sure they got it fixed now. I bought one a couple years ago. They didn't have it working right and I sent it back explaining what was wrong. The eccentric that made it retard was not aligned correctly. They said they would fix it but I never followed up on it. Morris doesn't make a mag with a mounting plate for the Commando (Joe Hunt does). But the MRA-G cover with the retard lever is supposed to fit the Joe Hunt as well as the Morris. I dropped the ball on magnetos because I've been busy concentrating on products of my own design.
*****************************************************
Here are the instructions I wrote up when I was adapting the Morris retard lever to the Joe Hunt Commando mag:
Magneto Retard lever mechanism
Replace original points with supplied set, install brass eccentric shaft. Turn cam so points are centered on lobe, turn shaft and stop when gap is smallest largest, set points to .020 inch (0.5 mm). Install new gasket and cap, with o-ring(s) fitted to shaft,. Start with largest o-ring. Push down on the cap by hand only to see if the cap closes against the gasket. Then grab the brass shaft with your other hand and push/pull on it to see if it moves up & down. Choose a combination of Orings so the shaft does not move up and down while the cap still closes against the gasket by hand. Tighten the cap screws gently while checking that the Oring(s) pressure is not too great and that the cover closes against the gasket without too much additional turning of the screws.
Next, install lever with set screw against flat, magnet facing down, and adjust height so
that tip of magnet contacts side of cap screw. The magnet keeps the lever in the advanced
position. Operate lever; if Oring(s) are too tight, they may squish out of place, and lever
will spring back rather than "stick" to the cap screw. Use low strength loctite on set screw. Remove lever when removing cap. For full retard, flip lever clockwise all the way to side of cap. This will retard your engine approx 20 degrees for starting.
Jim