Please help someone who has no practical skills at all....

Has anyone worked out how the adjust the door mirrors on the ARP4? One of mine on the driver's side is very loose where the arm goes into the black fixing on the door and flops around. I can't work out how to tighten that.

Any tips please?


AR P4 Kingfisher Blue - Morag
Formerly 2007 Plus 4 - Molly
Worcestershire