7000 posts about this, I just want to make sure I do it right. I have a new tumbler and keys in my possession.

1. Turn key to position 2 (run position, engine off)
2. push in a paperclip in the little slot to push up some tab inside.
3. Unscrew the black thing surrounding the lock cylinder.
4. Remove the old lock tumbler.
5. put in new tumbler.
6. set key position same as the one removed.
7. Screw black thing back on.
8. Test and done???

Do I understand the process? Yes, key still turns now but is getting moody.

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1985 300D 197K - Semi-Daily Driver Diesel
1998 Volvo V70 AWD 226K - Daily Driver 2
1998 Volvo S70 140K - Wife's DD
2003 GMC Sonoma ZR2 Option - Rusty Truck
THE BABY 1958 220S Sedan 66K All original, never restored and never will be.