Nuts
OOhh Can be very tricky ....
A . To remove
B . To fit
Lots of choice available too ....
Brass = Plenty of sustain and reasonably cheap
Bone = Much the same but can suffer with dead areas
Ivory = Poor Elephants
Tusq = possibly the best solution
Graphite = Possibly the best solution
Plastic = Avoid
Warwick Adjustanut = Allround good and available on the bay
Solution is take to you local tech .......but if you decided to DIY be very careful ......you dont want to destroy your fretboard .....
The nut can release if you aim VERY carefully with a BallPein or similar instrument and a Hammer away from the body
You ll need to secure the neck and ensure it wont move ..
VERY tentatively position the point and tap gently to start ...
If the nut is plastic it may release whole, if bone it will splinter or start to break into bits ....be very careful wear eye protection of course
once its out you may need to fill and file and then prep for the new install.
You will have bought maybe a precut nut which is pregrooved .......
if you buy a blank you will need to groove ......ouch more expense on buying fretfiles
measure the width of your neck accurately so the fit is spot on .
Dont learn the hardway but take your time if you decide to do it yourself ....
Hope thats of some use and .be careful
Best of luck
V8