I can't get sound to come out of the right earphone

If you hear sounds from only one earphone then most likely there is a broken wire to the earphone that is not producing a sound.
It is difficult to determine exactly where the wire is broken and repair. I suggest you get a new earphone.

Then you need to adjust the earphones plug in, adjust it gently and it will sound right on both earphone. It is the plug that is causing the problem. Adjusting it will solve the problem for you.

Hi

Have you tried swapping the jacks left to right or right to left to make sure that they are in the correct sockets because only

Headphone jack compromised

your ear input female jack is stripped try another new pair of earphones if not you may have to take it in for service.

wire contack must have broken

It is very likely that the problem is in your MP3 player and not your ear phones. If it is still under guarentee, then take it back to where you bought it. If not it may be that the earphone jack plug is faulty? It is a trade off between the cost of repair against the cost of a new one. These things are often glued together so opening it could break it anyway - sorry

I inserted a drill bit that fits the exact size of the aperture and twisted it around a few turns and it is working better.

Heath Robinson eat your heart out

If its less than 1 year old, have it replaced. Its a loose connection on the circuit board. SanDisk Technical Support 1-866-726-3475 Best of Luck.