Leaking toilet shut off valve
As I was shutting off the water to the toilet this morning (to re-attach the chain), I noticed water leaking from the shut off valve (1/4 turn type). Probably my fault as I did it as the water was flowing. The valve only leaks in the process of opening or closing (it doesn't leak when it's either open or closed if that makes any sense) Can these type of valves be repaired (there's a little screw in the front) like the other style screw type valve, sorry don't know the name? Should I leave it or is this a sign of impending failure?