Cheap tuners on cheap basses can be feel rough, but a quick go with some coppa slip on the worms, and a good few turns to remove plating flashing and improve the mesh, then a clean and dab of vaseline can work wonders... not Schaller wonderful, but a great improvement, especially when a set of tuners can be a third of the price of say a Harley Benton... along with a smooth and pencil lead in the nut slots.
And the recent post on High Mass v BBOT and tone was an eye opener, me preferring the BBOT... often an upgrade is for the eye.
Saying that the likes of Wilkinson, Tonerider, Entwistle, Maida Vale etc at the lower end pickup price point, can breath new life in to a lagging purchase for £20ish.