XT90 Handle Cover Outlet Mount Connection Protector Box with cable clamp

Warning: I just found out that the hex nut spaces are too big for standard M3 nuts and just a bit too small for M4! What fits and doesn't spin is M3 square nuts!

First approach to a connection saver with cable clamp - with source so mix it up!
And I just added a keyed version and with tactile 'polarity hint' (having a rounded and squared edge). In the latest version I also added grip features to the handle and also teeth to hold the cable (additional hot glue or silicon may be required depen