I would be interested to know how the ZK screws are tightened at the factory

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Best regards, Christian
Okay, I'll try: If the images don't arrive with you, please let us know. Unfortunately, you'll have to assemble the link yourself, as the forum isn't powerful enough

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http://db3.bosch.de/cgi-bin/cgiWebLinkImage.exe?sid=2571030&action=jpeg&image=\\Grommit\arena2\Bilder\at\0399\00002527.jpg
http://db3.bosch.de/cgi-bin/cgiWebLinkImage.exe?sid=2571030&action=jpeg&image=\\Grommit\arena2\Bilder\at\0399\00002521.jpg
CU Gremlin.