Empty a Can of Coke into a plastic bag, put your boom end in the bag !
coke will fix the jam
then use dry lube.
clean your gear !

Hmmm will definitely try the vinegar trick as I don't have any coke laying around. I rinse the boom every session Will definitely try the dry lube. Also I just checked the entire tail piece including the rope in the water/vinegar mix; is that ok for the rope? no damage to it?

Thanks!

I've used compressed air with success.

I had a similar issue with the pulleys on my mast extention. I hadn't been used in a long while. so i secured it in the vice (not too tight to eliminate potential damage) soaked the pulley wheels with CRC or you could use WD40 or any other type of skunkpiss, thread some downhaul/outhaul rope through and work it until it becomes free. Keep doing this and continue to soak with the product of your choice to wash out any corrosive material.

when you're finished go to the fridge and select the beverage of your choice or have one on hand as your fixing the problem