When I sold cameras for a living an old lady bought a black Zenit E from me and a couple of weeks later she brought in her camera and asked me to remove her first film from the camera and have it processed and put a new film in.
When I took the camera out of the E.R.C. there were hundreds of small dents in the cameras base plate, and when I asked her what she had been doing to it she said "oh my stair carpet was was coming loose and was dangerous and I don't have a hammer to tack it down with, so I used the camera " .
I tested the Zenit and it still worked perfectly, and I know for a fact it worked for the next three or four years at least, so you can literally "pound nails in with them"