They are surprisingly durable, as in, over many activations, never had a problem. Those little springs, for want of a better name, come in various sizes. I have used smaller ones to make my own much lighter versions. Made one with the wiring sandwiched between two smalls strips of cocobolo wood, and attached to the side of the MTR3 with magnets. Below is a photo of another. This one is built into a dental floss case, and plugs into the key jack. The small metal wedge above the plug slips into the seams in the case of the MTR3 so it won’t rotate in use.
73, Fred kt5x (aka WS0TA)
