As a double Ace Airscout, and advancced high school student, 1947, I was one of the instructors for dozens of pilots who trained on our Link Trainer.   I vividly remember using the tracker and having pilots fly paterns, from takeoff to landing.    Yes, our High School was unusual, the principal an enthusaistic pilot and got the school board to have the Link Trainer installed.    Sad the instruments do not work, students lived by the aritificial horizon and altimiter.,(reply>), @Paul Frederick appropriate thing to do is remove it, and it'll never be a problem ever again, even if some idiot kid licks it.,(reply>), @tsm688 there must be a way to stabilize the old paint. Using the appropriate protective gear, of course.,(reply>), @Paul Frederick Brand-new radium paint is fine when it just sits there (except for the people who died manufacturing and painting it of course).<br><br>60 year old radium paint flakes and becomes dust and becomes a genuine hazard - you don't want it on or in you.<br><br>It must have been a lot cheaper to take the instruments out than to clean or replace them.,(reply>), so your over 75 years old,(reply>), Yes but they all died from horrible radiation! Why just sitting in one of those things is ground zero. The horror!