A number of members have mentioned problems with early Schaefer Jib Furlers seizing up. Note that you should never use petroleum based lubricants on Marlon bearings.
From Stan of Frankie Anne C380 #247 East Greenwich, RI:
I just had to fix the same issue. The bearing design in the lower unit was changed at some point. The newer models have, I believe, bearings in tracks rather than loose. The unit still needs to be rinsed periodically but holds up better. The lower swivel with the new design is available from Schaffer and costs about $200. I opted to have a rigger do the work due to some complications but it’s a reasonable DIY job.