I have a similar issue with mine, I only use it a couple of times a year and each time it seems impossible to get it to fit, I know that I must have figured it out last time but each time I do it I have forgotten the knack and it just sits there limply!.
'Priming' the ball bit is key and the instructions don't make any sense to me, I end up trying the key in both positions, push the switch in hard (against the floor) and twist until it clicks.
Once it is 'primed' it needs jamming in the car, that triggers a spring and it clicks in place, you don't need to twist the lever or use the key to get it to engage.
Hope that makes sense
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