Those lines from the dent, might be the reason the dent has this form.
I think it was you that mentioned the stamp size sticker on the upper sidepod wing during pre-season testing. If I observe it correctly on the Melbourne pictures they no longer have the stamp fitted but instead it looks more like a dent now and on the crash impact structure wing there are 2 different stickers or perhaps holes.
No more bellevilles. Any guesses as to what's inside the cylinder?
Hydraulic inerter or gas.