Does anyone have an idea as to what the best Normally Closed tether switch to use. I currently use those cheap SPI, Parts Unlimited, Kimpex red rubber top tether switch and they are junk. A lot of intermittent high speed misses. If i run down the track pushing on the rubber cap, i can make it stop missing, the second i let go, it will interment miss. I have searched and can't find a decent tether switch, they are all the same. BTW, i even drove a tiny screw into the rubber knob inside the cap which helps some, but i think it's more of an internal electrical connection problem.