Answer:
Without a bridle or a saddle across a thing I ride a-straddle. And those I ride by help of me though almost blind are made to see.
I am the thing that is used to make your weight. What am I?
A hole in a pole. Though I fill a hole in white I'm used more by the day and less by the night
I am a nut with a hole. What am I?
What goes through towns and over hills but never moves?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.