Turns out you can teach an old DAG new tricks!
Upgrade your existing Park Tool DAG-1 & DAG-2.X derailleur alignment gauges with a new indicator head that allows the rod to flip out of the way, addressing the single biggest issue with the original design. It costs less than the difference in price between a brand new DAG-2.2 and the DAG-3 and you don’t even need to modify the DAG so it’s completely reversible if you desire.
3D printed in PETG and uses M5 fastenings for the thumb screw and pivot bolts.