U-bass tuners

It seems that several folks have had problems with the tuning machines on the Spruce u-bass. Mine are already sticking. Has anyone tried to convert the stock machines to the Hipshot Ultralights that are used on the high-end u-basses? If so, is any modification needed?

I don't know if the Hipshots are any better. I have the mahogany U-bass and had to replace the D tuning machine because the shaft actually bent from the over winding of the string. (Came from factory that way).
Kala sent a new one under warranty.

Bill