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Just a thought, is turning the thumbscrews to finger tight without using a screwdriver sufficient?
Depends if you have put on enough paste tbh and how viscous it is.
I always torque them up. Difficult to overtighten without applying significant force.
Worth noting that many years ago I broke a retention bracket when screwing the top on: https://forums.overclockers.co.uk/posts/15129845
To be fair I thought it was a terrible cooler even though people seemed to think it was good value.