Remounting CPU cooler

[Mauro12]

My (old) secondary PC was heating, so I decided to provide new thermal paste. But when I try to remount the CPU cooler (Intel97379-003), the four plastic feet does'nt intend to enter their holes.

When I try to push the plastic seems open and crash instead of entering.

Thank you in advance for suggestions.

[AlHill]

picture please.  and, how did you remove the cooler?

Doc (not an Intel employee or contractor)
[W10 is today's XP ]

[Mauro12]

Ok, thank you. Pictures are in attachement. 

I remove the cooler turning  anticlockwise the top of the four feet. No problem to push it off. 

Now, to remount the cooler I turned the feet like you can see in the first picture.