My English is not the best, so I think from now images will be more self-explanatory.
Yes you are right. Without C and D, a tower will be unstable unless you use a connector adaptor.
But the question is why C and D is not released? We have been waiting for years for something like that to be released.
Yes you are right. Without C and D, a tower will be unstable unless you use a connector adaptor.
But the question is why C and D is not released? We have been waiting for years for something like that to be released.