Putting Bearing on Drill

[Tenson]

Thanks for the reply. I actually just tapped them onto the shaft. It wasn't as difficult as I thought it would be.

However... once assembled it has a clunky notch feeling as it rotates, just as it did with the old bearings! I thought 'shit I mashed one of the new bearings' so I took it apart again. Not assembled, each bearing feels smooth but assembled it has a clunky feeling as though the outer race has an indent and bumps as each ball rolls over. What's going on here!?

Incidentally, the old bearings feel smooth once removed from the drill.

This is the assembly. The central rod is held inside the outer sheath by two 6201 bearings.