I have a 12.5 arm on a TNT-5. I also have the WallySkater that allows me to measure the amount of anti-skate force being applied by the twisted wires. By twisting the wires I can get anti-skate set within the desired parameters both at the outer grooves and at the inner grooves. And with no anti-skate devices except the wires, there are no parts to vibrate/resonate which is the problem Harry Weisfeld has stated he was trying to eliminate.