Thanks for the replies guys.

I think 0.15Nm isnt enough and they are pretty big without gearing.

Now i am thinking to repair these and gear them will be more costly than buying say 3Nm Nema 23 steppers?

Although accuracy is good i doubt very much i will need much below 0.25mm (and thats being REALLY tight for hobby use).

I may pass on the servos and just get the steppers.

Cheers again