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Originally Posted by Gooserider
What I'm planning is probably similar. I'll take a peice of flat stainless and mill a pair of "legs" that will each grab all three lugs on the bottom, and have an approx 1/2" hole at the top. Then take a crossbar of 1/2" dia SS rod with a ring groove cut near each end to catch the legs. I will then use a 1/4-20 bolt to push down a 'punch spring' (that I purchased from McMaster Carr) chosen to give approx 25 lbs pressure when compressed about 25%. The spring will be located to center on the CPU die. This should give the right pressure in a reliable way, and the single point of contact on the spring should cause the WB to 'wobble' any amount it needs to in order to get flat contact across the die.
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I think a 1/2" crossbar will take up too much room. Even with the 1/4" one I use, I have to deliberately design to leave enough space between the barbs/hoses.
I tried the groove idea, too. Without the endplates firmly affixed to the crossbar, mounting sucks. It was a total pain trying to keep everything aligned.
Got a picture of how you'll use the spring? None of my sprung concepts made it to reality.