It is not a good idea to bypass it, it is there for your safety and the safety of your children or pets.
I have provided a link of one I found for purchase in case you lost yours.
The treadmill may stop while walking due to issues with the power source, the safety key being dislodged, or a malfunction in the treadmill's motor or belt.
Though it is somewhat risky, many people use a treadmill without using a safety key at all. If you do not want to do that, go online and see if you can get one directly from the manufacturer of the treadmill. The keys are only plastic and relatively inexpensive. There may even be a store near you that sells that kind of treadmill and stocks extra keys.
If the walking belt has shifted to the left, first remove the safety key and unplug the power cord. In case your treadmill stopped moving, then its time to replace it.
How do I obtain an instruction manual for Proform model 831297761 and safety key?
You can purchase a magnetic safety key for an Elite 507 treadmill from various sources, including online retailers like Amazon, eBay, and fitness equipment specialty stores. Additionally, checking the manufacturer's website or contacting their customer service may provide options for replacement parts. Local sporting goods stores that sell fitness equipment may also carry compatible safety keys.
bypass key on a trooper
This treadmill comes with a magnet emergency kill switch. Instead of a key, the jogger is connected to the treadmill with a magnet on a tether. If the magnet is disconnected from the unit, the treadmill stops.
how do you bypass the anti theft security chip key if your only key is bad or if you have no key at all please help
GO to www.vatslikeabigdog.com it tells all about how to bypass the VATS key system with pictures and all.
Burt
buy a DFVATS Bypass Module from www.bakerelectronix.com
Simplest is to get another good key. If that is not available then you need to modify the wiring harness to bypass the chip reader by inserting the resistor elsewhere in the circuit.