Rare for Exo's to make noise
I took a brand new set to the sunday meet and the constant saying was how quiet they were In fact it causes problems as people don't hear you
Sorry to correct you here Graham but 3 in 1 is oil and I wouldn't sugest using it on them as it can react with some nylons
Any silicon based spray lube/grease is fine
WD40 contains no silicon but it also contains very little oil and is the kiss of death to anything with ballbearings as it washes the grease out and leaves them to run dry
Don't get me wrong WD40 has it's uses (Many of them) as a de-waterer and anti rust coating it is fab but not on nylon bushes
Get a vid up and let us see and hear them and then we can give advice
Jason