capture shortcut not working in many apps

The keyboard shortcut to capture a rich text note is command-) in Safari and Preview. In many other apps (like bookends) however, the shortcut has changed to command-@, which is impossible to press on a german keyboard without the alt key (which triggers other things).

How can I change the capture shortcut in the service menu?

Service scrubber (see http://www.versiontracker.com/dyn/moreinfo/macosx/28681) provides the possibility to change shortcuts.