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Originally Posted by pHaestus
Repeatability may not be affected SO much because the source of the variability is presumably the thermal paste application (and how it spreads out of the interface when you tighten it down). I would assume that slightly off-flat wb mounting will result in a different final interface (and performance) than a perfectly aligned mount regardless of the pressure you use. That's separate from the force you apply in other words. By taking great care in how I do things I can generally get to within 0.2C dT of my best mount pretty consistently even with ~30 lb force.
You would really stack the deck against wbs that use the socket lugs or anything other than 4 hole mounting by cranking the springs down on the 4 hole blocks to far past specs while the other blocks are fixed at the mfgr-supplied "safe?" settings. I don't think you could put the same springs on a block that uses the lugs without shearing them from the socket...
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How do you know you're using a ~30lb force if you don't know the spring rate? It's not that hard to measure the spring load within +/-1lb if you so choose (+/- 1lb being better than nothing). I'm still hoping Cathar will know the spring load at 5 turn.
Also, without measuring the spring rate, how do you know that, at present, the cards aren't being stacked against the 4 spring blocks?
At this point we don't know what the load is at 13 turns (it may be 30lbs for all I know) but yes, if it's too high then it's not an option.