I was cleaning up one of my adjustables and when checking the adjustment and lock-down functions, realized that the higher the setting, the further the TTO knob turns to lock-down. I went and checked some of my other adjustables, and they were the same. When set on 9, it takes about a half turn of the knob to lock, and on 1, it drops down to about a quarter turn. Kind of weird I never noticed this before. :think002 EDIT: Just went and checked my black handle adjustables, and they turn even less than the Slims and Fat Boys. On 9, they take about a 1/3 turn to lock, and on 1, about a 1/8.
There are a few adjustables that don't lock down at all. The "red dot" 195 Fat Boy and the 195 prototype are a couple I've found.