Well, glad you found it the hard way, 'cause probably none of us have ever lubed one of the bushings. My wife restrung many of these, and even the large rear one, and they never got in a bind.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired