I have a new to me Warn 8274 that came on a '77 fj45. The winch has a build date of April of 1977. When i took delivery, the free spool knob was very sticky so I took the knob out, cleaned it up to operate freely in and out. The winch operates as it should with the knob pushed in and engaged. When the knob is pulled out it does disengage the winch as it should but the line will not free spool out as it should. What would cause this?