Hi, anytime i restring and tune my custom guitar the B string ALWAYS comes straight off, ALL of the other strings are tuned correctly and so is the B String but it just pops Off. I'm Using Drop D Tunning if that makes any diffrence, Anyone know a fix? thanks
its either you tightened it to much so now the string is flat and slips out or its too loose
it could be the piece inside the saddles not locking the string down right. take it out and clean it out with some pipe cleaners or something of the like, then pop it back in and try it. if that dosnt work, take it out a gain, put the string down in more and then put the black piece back in and lock it down, that should do the trick.

i use to have the same problem and thats what helped me