Looking at purchasing 1KW 24,000 rpm spindle

[Steelhead Steve]

I am looking for impute on purchasing a Asian spendle. What are your imputes as to air cooled or water cooled. Actual power compared to KW listing of spindles. Drives are some better than others. E-Bay is full of these along with Keling, CNClink and Rex machines is there a perfered seller? Have any of you used one of these wired for left hand rotation.
Thanks ahead for your impute.

[Al_The_Man]

If you are talking about a 3ph spindle with a VFD, the direction is selectable via low voltage input, FWD/REV.
Al.

[Steelhead Steve]

I have heard that possibly the grease in the bearings could move away from the necessary components it the spindle has been run one way then reversed.
Has anyone changed rotations and operated these spindles for an extended period of time?