Yes, Paul, I'm cheap enough that I haven't upgraded to the new Sawzall with tooless blade changes...I need the Allen (Hex) key that piece of rubber holds:-)
The receptacle has a metal backing plate; the cord can enter from either the bottom or the back. In either case, this metal piece should be anchored to the wall, and a strain-relief clamp should be used.
In this install, the cable (romex) was fed through a hole in the floor, into the receptacle without any strain relief. Nor was the plate anchored in any way.
This could have been a legal install....no reason not to mount it to the floor....but no effort was made to do it correctly.