Use any screw on the chassis of the preamp. It is the same ground as the one that broke off!
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Is a 5vdc ground the same as a 120vac ground?
Not ALL grounds are equal. Really they are not.. AND you don't want them to be either.. A 5 volt dc computer ground is not shared with 120 volt ac ground.. A - doesn't always mean ground, there can be - and + voltage from a neutral position.. The way a joystick works with many variable voltages. Analog remotes.
Any screw will do IF there is a white metal contact. CLEAN the screw and make sure the screw hole is good and clean.. metal to metal..
You can drive 12" nail through it and use jumper cables too.. Oh OH.. That's vampire slaying, with a twist... :-)