I had a few guitars but the nut and bridge were plastic.
I located the tusk nut and bridge material but no groves so I went for the very small files,one for each string size.
The bone tusk material makes a big difference and it also makes me feel better knowing that I can do it and save my money.
I also installed a pre-amp,and MIC with a blender in 4 other guitars and it looks factory finished
Some times I never seace to amaze myself:-)
BOB LECH