Love my Peterson, but this happened to one of my Stroboclips (bolt fell off, allowing tuner to separate from clip). I contacted the manufacturer who sent me replacement parts. This was a few years ago, hopefully they are still doing this.Great Tuner, just remember to occasionally tighten the screw and bolt that attach the tuner head to the clip. Otherwise the bolt will come off and vanish
You'll not be able to replace it and as far as I know there are no replacements for the screw or bolt.
Anyway, thanks for the reminder, I'll retighten the bolts on mine.