[wichman3]

Sounds like the bearing to me as well. You may not have to replace them, try lubricating them first. If you can disassemble to the point where you can get at the shaft, use a grease with teflon, then reassemble.

This one such grease. (I use the one available at HF and other retailers):

https://www.amazon.com/Tri-Flow-TF23004-Clear-Synthetic-Grease/dp/B000C15MUU/ref=sr11?ie=UTF8&qid=1482073672&sr=8-1&keywords=teflon+grease+tube