Thanks to everyone for the help! I'll take pictures as I do it to add to the DIY bank. My fingers are crossed that I'm not going to be adding one for head R/R, but if I can get the adjusting nut all the way down to where the lock nut's stuck, that suggests it's the lock nut...
I'll use 15-40, and carefully wirebrush the threads before I put the rocker towers back on. 38nm is a lot of torque for those little hex screws!
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1992 300D 2.5T 249k - Parked with a bad transmission
1981 300SD 142k - Daily driver
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