Woomera, I've seen several types of control locks on Barron. One was a long steel rod that locked the colum and went over the throttle with a red metal flag. No way you could not notice! Another used a squeeze together spring loaded lock between the rudderpedals, plus a cable linking it to the top wheel lock. The Barron I remember had the second type, with the cable long gone and the top lock almost invisible. The rudder locks are hard to see as well, except for the wire cable. Horrid things!!