I think in most cases there's going to be a better solution than actually doing this, but wing bolts are one way to go. Since most of the accessories brackets in question have recessed holes for the bolts, you may need a spacer of some sort in between, like a presta ring.


There are literal quick release screws, usually M5 and bigger. My light already came with such a system:


Reading the question I was more thinking of bits and pieces you want to remove when you make your bike lighter for an occasional race, but securing items after your commute implies frequent removal. Some more valuable things like lights quite often have dove-tail mounts with some kind of latch, easy to slip off and quick to re-install, and rechargeable at ...

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