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Hi SimonI did replace the spindle bearing quite long ago. Recently, I wanted to drill very small holes with carbide drills. First the bearing was not so good anymore and second, the drill broke at the first touch with the material because the spindel could be moved about 1mm in coaxial direction. I then decided to improve it and added a spindle i have made earlier for a grinding atachment (but was not used anymore):The Spindle has a fixed bearing in the front, the rear bearing has a spring pushing the outer bearing ring towards the back. The Idea is to get a precise spindle because there won't be any bearing clearance. The principle is commonly used in grinding spindles:The spindle is now very precise and performing really well. Drilling the holes with carbide drills workd excellent after I fitted that improved spindle. @Steve: I didn't know that anyone had already done this!? Cheers Florian