3dXtreme has posted a review on the Senfu Copper Heatsink & Probe

The base is smooth to the touch with a few imperfections. Lapping is out of the question, unless you want to destroy all those coatings. The big hole at the bottom is for a temperature probe. It fits neatly into place and held there with a plastic cap. The entrance has 2 small hooks on each side to keep it secure. It's completely safe to use with a shim, an added bonus.

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