Optical Sensor for Dell MS 116 optical mouse

​Hi​

​I had bought a Dell MS 116 optical mouse 1 year ago and it was working great. Recently by accident I dropped it from my table which isn't much high. Anyway, after the fall, the pointer started lagging a little bit. It would work smoothly, then again a short lag, where I have move my mouse but the pointer takes some time to move on screen. ​

​Since it was no more under warranty, I disassembled the mouse and looked inside. Nothing broken, nothing out of place. I carefully took out the circuit board and looked at the optical sensor. There seems to be a very tiny scratch on the portion of the curve where the light from the LED falls. Can that be the problem? Otherwise there seems to be no problem at all. ​

​So if that could be the reason behind the lag, can you please tell me where I can buy the optical sensor separately? The glass/plastic part, whatever the material it is. The lag isn't too much disturbing, but still it sort of makes me feel uncomfortable while working.​

​Regards​

​Agni Sen​
​ ​