I'd give the MusicNomad ones another thumbs up, they cut cleanly and are nice to use. I bought mine separately from GuitarGuitar and worked out at £80 for a 4 string bass (I can live without the case)
The socket's deep enough but isn't getting a purchase - maybe a spanner might be the way to go - I have a 17mm and 19mm but no 18mm (grrr) so will have buy one!
I've installed Gotoh GB on my Sire U5 and it's fine except I'm not sure what size socket I need to tighten them up - according to Gotoh's website they're 18mm nuts but my socket isn't getting a grip. Anybody had experience of these know what size socket/spanner they used?
Cheers!