Unfortunately, nothing seems to work... One of the washers has decided to break in half and the rest of the tuners aren't what they're supposed to be...
However, I don't know what tuners to buy. Hipshot? Schaller? Gotoh? And if so, which types fit my bass? I've heard that Yamaha hardware is regularly "it just doesn't really fit", just like IKEA. I know you can buy parts at Yamaha, but aren't they super duper expensive?