Much easier than fiddling around with either a rivet gun or holding some tiny Nylock nuts in place, MFD fixing plate as a great way to keep your D size panel mounts in the exact place you want them.
Fixing Plate with M3 Thread for D sized chassis connectors
With its M3 thread in place, you can use MFD in either a front or rear mount application.
Simply place your D size panel mount connector where you'd like it, position the MFD on the rear, and use a couple of M3 screws to secure the connector.
Dead set simple.