An assembly having a positive locking device is provided. The assembly includes a solid body having a through hole arranged to receive a fastener. A fastener is disposed in the through hole of the solid body and secured to the solid body using a securing means. The locking plate positively locks the securing means onto the fastener. A generator including the assembly as well as a method to set a short circuit stop gap between the assembly and a support brace support the stator winding is also provided.