Grip for a writing instrument
FIG. 1 is a front elevational view of a grip for a writing instrument showing my new design, the rear being the same in appearance as the front; 
     FIG. 2 is a right side elevational view thereof, the left side being the same in appearance as the right side; 
     FIG. 3 is a bottom plan view thereof; and, 
     FIG. 4 is a top plan view thereof. 
     The broken line showing of a writing instrument in FIGS. 1-4 is environmental only and forms no part of the claimed design.