To install an auto cct (aka, auto self-destruct) the cap bolt must first be removed. Then, while tuning the exposed slot head ?ccw? apply pressure against the head of the unit. Doing this will allow the plunger to retract...keep going until it stops. All you need to do now is hold the screwdriver in this position to keep the plunger retracted while installing the unit into position. This may be a bit tricky and a few tries could be necessary, but you must seat unit with the plunger fully retracted. Once you have either allen bolt snugged up THEN you can "unscrew" the driver slowly thus allowing the tensioner spring to do it's thing. A helper can really make things easier with this procedure too, one person holding the unit in place while the other installs the mounting bolts.