mk1 sprinter wing mirror arm loose

[mneil]

when parked up i push the mirror arm in towards the door to keep it out of the way, however when i went to pull out the arm of the wing mirror the other day prior to driving away it did not stay locked in position; felt like the spring that holds it in place had died. anyone any answers and repair ideas short of buying a complete new arn.
thanks

 

[Roxie]

Tighten the bolt that holds it together. Look under the pivot point there is a hole with I think a torque headed bolt inside it.