RST Engineering wrote:

As to the AD on that switch, the owner can do the AD and sign it off. It is
REALLY HARD to do. You fire the airplane up. You take it to the runup
area. You turn the switch "off" with some reasonable force. If the engine
stops, the AD passes. Ten seconds at the outside. And that is worth a $150
switch to get rid of the AD? $150 buys more beer than even JAY can drink in
a day.

While it's probably obvious to most people, I just want to make sure
people understand this is to be done with the throttle at IDLE. Do
not crank it up to $1700 and do something that might cycle both mags
off and on again. You'll do what Rod Machado refers to as his
student's click-click-click-BANG mag check. Not good for the
exhaust.