Does anyone have experience with the Fender/Schaller Deluxe Staggered Cast/Sealed Tuning machines that would have been on some Fenders in the 2000s? I'm appealing to the collective TDPRI wisdom here. I have an early 2000 American Fat Strat Texas Special Stratocaster. For years it was my only nice guitar and I played the junk out of it. I've been trying to work it back into the rotation lately, but it is a little worn out and hasn't been staying in tune very well. I've widened and lubed the nut, replaced the two point tremolo (the knife edge was misshapen), and given it a full set up. It generally stays in tune, even with bending and a little tremolo, but then will suddenly seem to "slip" in the middle of song. When I check the tuning, most of the strings will still be in tune, but, for example, the low E will be really flat. Then when I go to tune it up, the tuner feels loose. It's not the windings on the strings. The strings are relatively new (not brand new, but not worn out either). I've never had tuners actually slip before (even cheap ones), but do you think the guitar would benefit from replacing the tuners? I'm looking at the Fender Deluxe Locking Machine heads. They seem reasonably priced, are staggered, and look like drop in replacements. But are they different enough from the Deluxe tuners I already have?