Actuator foot weakness - stage Y-axis actuator broke :(

@siddons that is probably right; when the actuator hits the top of the travel it should just stop there, because the motor won’t have enough torque to pull it any higher. However, it’s possible that the torque applied to the column is high enough that the twisting motion breaks the bottom of the column. Understanding the exact failure mode there is something we’re looking into. Figuring out a nice way to get a top limit switch would be useful; I’ve previously wondered about putting one on the inside of the actuator casing, triggered by the horizontal lever there, but never figured out if it was feasible to fit something in there.