The bottom of the tube sits inside the bottom collar of the hose, so, if the hose is not obstructed, there is nothing to prevent it from sitting in place.
However, it is not clear from your post whether the problem is at the bottom of the hose/wand or where the wand clicks in at the top of the chassis. Is it the "click" mechanism at fault or that it wont slide down far enough to click in?
Will it click home with the bottom hose removed?
Is the spring in the wand release catch there, complete and working?