PITA job if not marked upon disassembly!
It's likely not the maget for the adjuster, but the Adjusting Cam Sprocket itself not being timed properly when reassembled.
Your tech needs to go 'back in' and pull the front cover off to reset it.
There are also stretch bolts that CANNOT be reused if he's removed them!!
Hopefully he has some sort of ALLDATA or something? If not, LMK and I can try to forward you the instructions

__________________
Bill

1989 300E Smoke
1989 300CE Smoke
1989 190E 2.6 5spd Burgandy
1991 300E w/94 E500 body BLACK
1996 C220 Blue Azure 2000 body
1998 C230 AMG Kitted BLACK