My gigs these days have me changing tunings fairly regularly from standard to 1/2 step down from standard. Usually not more than once a week. Both of my basses seem to tolerate the changes fine with no special adjustments needed to work at the lower tuning. My only slight concern (probably borne out of my penchant for over-thinking something) is the nut slots. Should I be concerned about wearing down the nut slots prematurely from changing tunings up and down? I use round wound strings. The nuts are made of bone and when I change strings (every 4-5 weeks), I use a #2 pencil to "write" pencil graphite down into the slots, something I picked up on a couple of years ago. Will this be sufficient or should I go further and get something like the "nut lubricant" (steady, not going there...) that StewMac sells? Thanx.