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I had to do this job myself a few weeks ago ('76). An earlier post had said that the tracks were held together by stamped indentations and that they couldn't easily be taken apart. When I looked at mine, I saw what he meant, and I didn't try to get the tracks completely apart. Mine were really rusted, so I gave them a good shot of PB Blaster, then a bit of persuasion (hammer). After they started freeing up, I shot white lithium grease down the channels from both ends and kept working them back and forth. That did the trick for mine.
Do a forum search on white vinigar and seat tracks. Someone degreased them and soaked them in white vinigar to derust them. I just soaked mine in degreaser, wire brushed any rust, painted them and lubed the tracks with spray white lithium grease.
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
I used brake cleaner on mine to remove all of the dried and hardened grease. Worked them back and forth to loosen all of the old crud while spraying brake cleaner. This made them work much better. Then I lubed them with some white litium after painting the tracks. Much better. I could actually work the tracks by hand when done.