I didn't have to do this. Am I lucky (so far) or aren't all locking tuners the same?I had that problem using Thomastik Jazz flatwounds on a Gretsch with locking tuners. If the strings have the red thread at the ends, just make sure that you leave enough of the thread on the end of the string for the pin to clamp on to. I realize that the extra winds this results in kind of negates one of the advantages of a locking tuner, but I wasn't aware of any alternative that would work.
If you broke two low E strings at the tuning post while tuning up, look for burrs, a sharp edge, etc. on that post. Perhaps it could be related to the specific strings and installation technique, so more info there might be helpful. Are you possibly over-tightening the locking mech? I'm not sure if that could deform a string enough to weaken it, but only light to moderate locking pressure is needed IME.I recently decided to try flat wounds on strat which has locking tuners. In the process of tuning it up the low e string broke right at the tuner. Anybody else have experience with flat wounds and locking tuners?
I definitely had the same issue with a few brands of flats that had round cores with Gotoh locking tuners on one of my Fenders. It wasn’t a case of burrs or defective tuner and it happened on the low E string as well. I contacted JustStrings.com about the problem and they cautioned against locking tuners with these type of flats which happen to be very expensive (but are also far superior to other brands). You’d need to wind the string way too much to have the red cloth wrapping centered and locked by the tuner’s pin which does negate the purpose of locking tuners so I don’t see that as a solution. D’Addario Chromes with hex core and double winding do resist this problem with locking tuners though they’re not my favorites so I use LaBella roller wound strings as somewhat of a compromise for that guitar with the locking tuners. Hope that helpsI recently decided to try flat wounds on strat which has locking tuners. In the process of tuning it up the low e string broke right at the tuner. Anybody else have experience with flat wounds and locking tuners?
3. Or, crimp the wound string and flatten the wrapped wire where the strings exits the tuner post hole so the wrapped wire is less likely to slide off the inner round core wire.