What happens is the winding tries to part company with the steel body and that's why the bottom pushes down. It may be possible to carefully press it back up enough to make it operate, but that might crush the tube in the centre. You'd then need to support it.
Wasn't there a recent ad for a couple listed as GS but possibly they were CX? There's a slight difference as angru pointed out.
Wasn't there a recent ad for a couple listed as GS but possibly they were CX? There's a slight difference as angru pointed out.