It is always nice to keep the screw down type of valve covers finger tight, but a nuisance to have them vibrate open. I have found that small rare earth magnets about 1/4" diameter put at the base keep them from undoing themselves. They also keep the covers up and out of the way for adjusting the valves by putting them at the top. There are many other applications for using these little magnets to keep things from buzzing loose.
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Shake proofing valve covers
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