I bought a set on ebay and the are too weak. They work but aren't strong enough to keep mod from firing when you set it down with a heavy atty. They're n42.
I've got a set of n50 on the way and those should be fine.
Last time I'm posting this:
N42 is Nemesis Spec strength.
Magnets are not to weak
Improper installation - to large of a gap between causes wobble/slop/free firing.
I run an Ithaka, filled to the brim and it never tries to fire when sat down.
I also placed a thin Nylon washer under the lower magnet to set the gap.
N50 will work
3 magnets will work
Both will give more resistance than needed.(Stiff switch)