Howard Winter wrote:

> No I don't think it is, the "nut" unit is well lubricated during
> manufacture and I'm not aware of any maintainance lubrication
> requirements.  What they are sensitive to is dirt on the track - you
> need to shield them from dust, swarf, and so on, or they will start to
> jam as the balls try to roll over the contamination.  

Ah, makes sense. I didn't know they were so well lubricated for life.

> If you can afford it, 

Yes, I've seen this problem already :)

Gerhard

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