Hello , i have a "problem" with my Logitech G19 since i got it very cheap as you can guess its used keyboard but everything works. So only how should i say it , problem is that the keys are woobly and somehow loose ,they move too much, you can see that they are very very used. So i am wondering is there any chance to fix or repair it, is it maybe something with the rubber beneath them? I would really appreciative any help.