The cap on a threadless headset is used to set the preload on the headset bearings with the stem bolts loose. Once the stem is tighted, the headset cap can be loosened. If all you are doing is changing the cap and you have not loosened the stem, you have no worries. Change away!
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Originally Posted by
colorider
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.