PP arms do move a little, my old one used to on one side when tensioning mains. It made it look like the top was deforming on one side doing crosses.
Thank you for you help I think it's the arm the culprit. I've already see it moving few times.... Do you think it's a big issue (stringing like that is it dangerous for the racket?) Or should I buy another one?
I generally don't like the idea of the racket to have any sort of play in the mounting so I would ditch that machine instantly. Supports can only apply said support to the frame if they are in contact with it. It's always the same thing if you start upgrading a crappy machine - you will only make it a bit less crappy until you discover the next flaw. My advice: Start looking for a decent machine and try to sell that PP in its original state (put on the drop weight system along with the original clamps/bases and the side supports again). Maybe get yourself a PremiumStringer 3600 or comparable. If you add the upgraded clamps and bases to that one, you will have a dead solid setup.
