Those familiar with the Mk.2 (which I am not) would remember the cocked
tailwheel problem, when such a condition post take off would result in the whole
undercarriage assembly failing to retract
The solution was a T-bar spanner that could be connected to the tail wheel via a socket on the floor of the rear fuselage. Many happy times were spent trying to centralise a cocked tail wheel - the T-bar took a great deal of force to operate, however once the wheel moved it very quickly rotated - usually with the result that the wheel moved 180 degrees into a position 90 degrees out of kilter the other way - start again and back it went, cocked in the original position!
Another way to stop the undercarriage operating was to throw chaff out of the flare shoot in the fuselage floor. Apparently. it would suck up into the rear wheel bay and foul the electrics. (We had to resort to throwing the chaff out of the beam windows).