My Profurl needs new bearings and oil seals
in its lower drum, and if left unattended it seizes. Application of large quantities of penetrating oil
(WD40, Kero, Diesel) and gentle repeated application of percussive force (hammer and wooden drift) will loosen it and it will be fine for a while. Lying on the deck
with a flashlight I can see where the bearing seal has degraded and split. The correct solution is to replace the bearings, but the oil also works for now.
Have you tried adding oil to your bearings? Have you inspected the bearing seal?