Uh oh, maybe I lost my connection the last time I posted.
Well. Shims may be helpful. For some people.
Out of the many PCs I've built over time, not one has had a shim.
My PC at home has a Volcano 5 HSF, which I've removed, well, over a dozen times.
Knock on wood... I've never come close to cracking the core.
If you follow the instructions off AMDs site for HSF installation, you might be OK.
I hate shims cause they might just lift your HSF off by a fraction off an mm, and that's disaster....
Different people may have other things to say.