Headlock' type systems are great for replacing the Star System in threadless headsets.
Not only do they 'never slip', but they also add some extra security in case of a steerer failure.
Gusset UK developed a simple solution to the headache of solving which length Headlock system to buy.... They made a SET with 3 different length Cr-Mo bolts. (Just fit the one you need !)
Supplied as a set with Alloy Top cap and bottom T-nut to fit 1 1/8".