Alternatively if CPU/Heatsink pair doesn't follow specification then ebay has plenty of very thin (e.g. 0.3mm, 0.5mm etc.) copper shim options to fill potential clearance and improve thermal conductivity for these gaps (although not advisable to use with aluminum-based heatsinks because of electro-chemical reaction and corrosion, therefore best material is up to your heatsink' base), these can be easily cut to right size.
Amount of force to apply on screw rotation if shim-modded approach is used to ensure right pressure - is up to your expertise of course (since it introduces extra risks into equation).
Shim mods also allow to avoid polishing surface if these aren't even enough (e.g. angled a bit) and you would like to preserve heatsink/CPU in original form (so you can work on polishing shim instead, used as intermediary thermal conductor), it partially helps to solve void warranty/return problem.
Amount of force to apply on screw rotation if shim-modded approach is used to ensure right pressure - is up to your expertise of course (since it introduces extra risks into equation).
Shim mods also allow to avoid polishing surface if these aren't even enough (e.g. angled a bit) and you would like to preserve heatsink/CPU in original form (so you can work on polishing shim instead, used as intermediary thermal conductor), it partially helps to solve void warranty/return problem.
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I have heard of people plugging in 24-pin ATX power cables the wrong way. So it's probably worth to call for some caution when giving the advice to apply more force.