The anchor system that came on my daughters pontoon boat seemed to bind some and the drag chains was hard to pull up, so I modified it myself. After the modification it worked perfectly and pulled up smoothly.
I went to the hardware store and bought small pulleys that would fit the diameter rope we were using. I bought a couple pulleys that were fixed and a couple that would swivel, and the appropriate sized stainless bolts and lock nuts.

Photo's attached below for visual aide:






Hope this helps you some.