I'm a rookie double bass player, switched from electric onto it about 6 months ago with my friend's bass. It's made of spruce and has a pretty good resonance, so I figured I'd buy it and upgrade all the hardware on my own when I needed to. I basically got everything fixed or replaced except for my machines, and now the D-string piece is completely bent and out of place. Any recommendations for a good solid 4 string tuning machine set? I can't afford any more than $200 for a whole set, so I'm hoping there's something reliable that's not pushing my price range. Help?