Agree totally with Angle of Attack. For the ab initio student, if you have the runway use it and get them to retract the flaps before putting the power on. And get them to identify that the flaps are retracting before the power is introduced. Single engine commanches are notorious for assymmetric flap retraction. Not fun once you are airborne.
As for the wheel barrowing, ever seen a Duchess wheel barrow after the flaps where left down and full power was applied, AoA?