| The solution for both of you guys is the same. Under the worm gear and sandwiched between the spur gear and the chassis, there is a small, spring steel plate that has two functions: to keep the worm gear trapped in it's cradle and to put friction on the shaft of the gear to give the tuner some resistance and keep it from rattling.
For you Spacemom, dissassemble the tuner and put a slight curve in that steel plate with a set of pliers so that it keeps the worm gear shaft in tighter.
And for you Linas, do the opposite! By taking out just a fraction of the arch in the plate, you'll decrease the tightness of the tuner.
And FYI - this type of tuner is the cheapest design and execution allowing the same tuner to be reversed for use in lefty's. Keep that in mind when you are considering Schaller BML tuners as replacements. They are made the same way and are subject to the same problems the SX tuners have. It's amazing but Schaller makes crap now. A better quality tuner is any of the Gotoh vintage tuners. Those are very well made and don't have the cheap retainer spring of these others.
Hope this helps. | 
