If it bothers you, you can obtain a complete replacement
https://www.skandix.de/en/spare-part...nator/1018610/
or just the long 10mm bolt
https://www.skandix.de/en/spare-part...anism/1018622/
but it looks as though yours might have sheared off in the threaded hole in the head of the 13mm bolt. This will either need carefully drilling out and re-tapping or it will be easier to replace the whole thing.