Rlee, you got lucky. Seized, unremoveable lower shafts are/were such a common problem, Hall and others once sold a specific kit to repair the damage from condensation. Because you had to use a Sawzall to cut clear thru one or both end of the assembly to r & r a stuck shaft! In a few cases, a 20-ton hydraulic press could not move the rusted assembly and risked cracking the cast iron upright. Some seized and ignored lower shafts either broke the shaft end or the lower a-arm. Can you say, 'Deferred Maintenance'?
That modified shaft ass'y shown (Hall Pantera also sold them) has an 0.060" drilled passage and zerk on each end to deliver grease to the two lower bushings. The spacer also got grease distribution grooves. This size drilling does not weaken the shaft appreciably. Further drillings etc can be added to complete the change-over from OEM yearly disassembly & hand greasing to external greasing. Mine is still working after 25 years.