Spring nut lock
FIG. 1 is a side elevational view of a spring nut lock showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a bottom plan view thereof; 
     FIG. 4 is an end elevational view thereof; 
     FIG. 5 is a perspective view thereof, the nut and bolt being shown in broken lines for illustrative purposes only.