84 SD, daughter's car. A few weeks ago she turned the key to the left to open the locks and it stuck in that position, wouldn't return to vertical. I jiggled and twisted for a while and eventually it returned to vertical. I put in some graphite and it's worked ok since. BUT, when returning from the left position, you can feel it 'catching' just as you turn it back towards vertical, as if something is not quite right. Anyone know what is happening and how to fix it? If it gets stuck in the left position the key can't be removed. It doesn't have that 'catch' when you turn it to the right to lock the doors and then back to vertical.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13