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Tj40 was right. The little bar can be pushed to the right and then push down hard on the hoop till it's about 2/3 all the way down. Then you can release the bar and a final push to lock it on the bottom. For two people, it would be very easy. I did it by myself and held the little bar with one hand and push down with the other. Hopefully, this will help people in the future since there's so little on it.
Thanks for all the suggestions.... finally
Yeah!! Glad my guess paid off! Glad to have helped in some small way.
And everyone loves a build thread......(apart from those people who just post 'you'll have more money in it than it's worth....')
:-)