Tuner Machines.

Please describe how they are not working. We often get questions that result from incorrect string installation and are not related to tuner problems.

 

Are the strings wrapped properly on the tuner? No overlap and top to bottom, no bunching on the bottom. If the tuners are stripped, go here to find a bunch of varying priced alternatives http://www.buzzardsbass.com/parts/tuning-machines.html
They sell replacement Schaller tuners individually for around $30.

 

FYI, a bit of slack doesn't require replacing tuners. Just make it a practice to tune UP to pitch, so that any slack is taken up. This is a good practice with all tuners on all string instruments.

 

Yes. Always tube UP to the note. Also if they are open frame you can loosen the screw in the center if the big gear and that allows string tension to always keep the gears meshed. That gear "drag' is the direct solution for keeping that type if tuner working smoothly.

A little bit of play in the gears is normal.

 

if you do need to replace the machines these BOSTON ones are cheap AND good quality View attachment 351221