I cut my own nuts and do my own setups, my tuning stability was 99% the tuners with just a tad of wild weather changes thrown in. When I switched to the Grover mini lockers my issues were cured, other than the little changes in temp and humidity this time of year creates in the Midwest. I will change my stock nut eventually but the nut was definitely not the cause. It's actually pretty nice given that it's an import.