All the blocks I have made and the hundreds of mounts I have done over the years I have never used springs. Yet 95% of the time I get a near perfect imprint of thermal compount with it evenly squished out the sides. Once you do it a few dozen times you can start to feel when it is leveling off on each corner. Also I uses a thick soft rubber washer on the back of the mobo where the bolts go through. Helps level a bit to.
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