When we first started retro-fitting MBs to 134a we used to close up the valve using that adjustment. Then they started selling 134a valves and it wasn't necessary. Now I resist retrofitting like the plague.

For almost all uses I would rather swap the valve than fix it. No matter the reason for removal we never reuse an old valve they are just too cheap and too important. That late 126 body has to have the worst access of any MB TXV. They are resealable though as I have been into many of them.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician