[RandallNeighbour]

Do you hear a creaking sound coming from behind your head when you go over speed bumps or hit pot holes or uneven pavement?

Might just be one or both of the pins in the clamshell rubbing up against the plastic receiving nut in the bodywork.

I took some lithium grease (not the spray kind but the nasty kind you dip your finger into and apply directly) and lubricated both the pins and inside of the plastic receiver.

Now the clamshell is squeak/creak free when I go over bumps and one of my annoying little issues has been resolved.

Hope this helps you too. Even if your pins are dusty and causing noise, it would be good to lubricate them from time to time to prevent noises.