This is the approach I used. no way was the "ear" pulling over the head of the standoff without breaking something. The standoff simply unscrewed from whatever is under the logic board and stayed with the fan assembly. WAY safe
ditto here - the 6.6 mm screws that anchor to the HD (now SSD) are T9
I had a couple of 3/32" drill bits in my tool chest. Worked perfectly (2.38 mm)
on my mid-2011 mac mini, that 3rd T6 post/screw had to be removed to get the fan out. It goes right through a hole in the fan housing. No way the grommet is slipping over anything without wreaking major havoc.