Hi Red. That wishbone I have also replaced (not OE, but Lemforder one), but the knocking was still there...
But yesterday when I closed the hood I've noticed something interesting:
https://streamable.com/l1fzx4
(hope the video is playable).
So when I push the mask without much strenght, there is a audible knocking and the reason seems to be the locks ( too much space between locks and bolt lock in mask). Those bolts have an adjustment, but the aluminum nuts are corroded so much they won't even move... I've already ordered new mask locks so I can tighten them to sit in locks properly....hope that will be the case!
I'll let know on the final effect...