DIY repair on Harta Mocca Door turnbuckle

[breeze1470]

Hi all my lower turnbuckle isn`t gripping onto the latch as tight as it should(part pic attached)any ideas on how i can remedy this issue,by not being tight the two stable doors dont close tight to each other as they should

 

[IanB1485]

I don't know , but have come across several the same issue - very annoying when one half of the door doesn't move with the other so I will be interested if any of the members have a solution.