I've just finished changing out the Corian nut on my LP Studio to a Graphtech Tusq XL nut, it all seems to have gone pretty smoothly, the Corian nut wasn't nearly as hard to get out as I thought it was going to be, I used a coping saw to saw a thin trench almost to the bottom of the Corian nut lengthwise then I used a pair of pliers to gently squeeze the two halves of the nut together, then it was simply a case of removing the pieces of the nut leaving the bare nut trench, I didn't even need to lean out any remaining nut material, all I had to do next was sand down the bottom of the new nut till I got the first-fret action correct, it took a bit of time but I got there in the end, all the strings on the LP Studio are free from Sitar-Buzzing and the guitar seems to sound a bit more tuneful.