Hi bjcuizon
imho, your best bet will be to buy a dongle which is already powered with a TCXO or CXO clock.
Modifying a RTL dongle is really tricky, smd are really small, and I think this is not the best solution.
I bought a Nooelec NESDR Smart, not expensive, and I'am very satisfied with its clock performance (miles away from low priced dongles with a simple 28.8M crystal)
Save your time and money, buy another dongle.
(I bought a better piece of hardware last month, a SDRPLAY RS2, 12 bits DAC resolution, very impressive)
Regards
Eric