Special tool for extracting blocked glow plug from Mercedes CDI .
Different application, works with Mercedes OM 611 , 612 , 613 , 646 , 647 , 648 and others
Absoulute professional tool - if no sucess with that tool, no need to try others - last choice only will be to remove the cylinder head.
To protect against damage - e.g. if tip of the glow did not move out completely ( that can happen if tip had blown up to bigger diameter) please inspect the cylinderhead well before restart engine !