So, I'm buying a new 6-string bass soon, likely the Brice, or something equally cheap. The reason I'm buying a new bass, is that both of my guitarists have gone to 8-strings (one has an LTD SC608B, the other a Schecter Hellraiser C-8) and I'm wanting to add a low-F#. I've experimented with my 5-string and the strings I already have on it, and while the low-F# is obviously ridiculously floppy, it works, and I like the low-F# much better than jumping up to unison for the F# stuff.
I'm looking into SIT strings, using a .165 for the low F#, and obviously it'll take a bit of work to set up the bass for F#-B-E-A-D-G as opposed to the standard B-E-A-D-G-C. Aside from intonation, I'm obviously going to need to modify the nut (and possibly the tuner/bridge for the low string) to accommodate the thicker strings. My questions are:
1) Would it be better to file the current nut to widen the slots, or have a new nut cut and swap them?
2) Is this the sort of thing I can/should do myself, or should I take it to someone who knows more about this stuff? (Keeping in mind that all the local techs are snobs who hate anything beyond a normal 6-string guitar/4-string bass and will likely take for-fucking-ever to get it done, if they're willing to do it in the first place, so I'd likely drive to Toronto or somewhere to get the work done)
If you're sure you won't be going back to standard tuning, I'd say try widening the slots yourself. Then if it does not turn out well, take it to a shop.