I don’t know, but my thinking, which I’m quite happy for someone to shoot down in flames, is that you are compressing something to an abnormal extent (that is to say more than the weight it has naturally got) then locking it in position.
To me, that doesn’t really seem a satisfactory engineering solution. Surely is better for it to sit as it should do (or as perhaps you want it to) without the addition of any weights to make it do achieve it. The springs and all the attachments are under permanent stress when you compress them and then lock them all into position. I just don’t like the sound of it.