I make my own using 3/32" diameter braided steel cable and either two aluminum end stops or one end stop and an aluminum ferrel. I drill a larger hole in the brake pedal tip to accomodate the larger cable. I drill another hole in my skid plate, making it slightly lower than the brake pedal tip in the resting position. That way you can make the cable nice and tight. When you depress the brake, the cable loosens slightly. You should still verify your cable isn't limiting travel of your brake pedal before your next ride.
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