Patent ID: 8334625

Claim:
A method for manufacturing a storage disk drive motor, comprising: providing a base member comprising: an upper surface; a lower surface; and a through-hole communicating with the upper surface and the lower surface, the through-hole having a circumferential lower corner at a lower end of the through hole; providing a sleeve unit comprising a flange lower surface and a jut locating at a radially inward side of the flange lower surface, the jut protruding downwards beyond the flange lower surface, wherein the jut has a radially outer circumferential surface comprising: a first outer circumferential surface; a second outer circumferential surface positioned below the first outer circumferential surface; and a groove positioned between the first outer circumferential surface and the second outer circumferential surface; inserting the sleeve unit into the through-hole; contacting the upper surface with the flange lower surface, the jut positioning lower than the circumferential lower corner, the first outer circumferential surface contacting the through hole; and plastically deforming the jut radially outwards to contact the lower surface and/or the circumferential lower corner, the second outer circumferential surface positioning radially outside the circumferential lower corner.