from various...
SMOKTECH Magneto Means Magnets
The Magneto mech-mod is the first I’ve used that uses a magnetic switch. The inclusion of a magnetic switch instead of the usual spring means the action is smoother, cleaner, without the worry of wearing out the spring action or breaking it completely. Some call it revolutionary, I call it smart engineering. The Magneto is going to outlive every other mod you have. And the “throw” of the switch is damn near perfect
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This revolutionary mod uses a magnetic switch. This means of instead of using a spring the Magneto uses magnets. Inside the switch there are 2 magnets, with the poles facing each other. This creates resistance to emulate a spring, but without a spring to wear out, so the mod will last longer
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taint naw springs to stretch,why I felt kind dumb in my fist post

Smoktech Magneto Telescopic