Why bolted on? Small and light usually means easily removable - put it in your pocket and there's less chance of someone coming along and either taking it or doing some random damage.
I always loose the lights that stay on. Most bikes here have lights that stay on the bike, but most bikes are granny bikes.
@withered_preacher started
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Why bolted on? Small and light usually means easily removable - put it in your pocket and there's less chance of someone coming along and either taking it or doing some random damage.