i use a piece of wood and sometimes plastic attached to the opposite side of the riser as the shelf with non permanent double sided tape, there is a small hole drilled in the end of this piece of wood with a small elastic slipped through then looped over itself,,, i then pull elastic around arrow shaft in front of fletching and then back over wood.
the arrow isnt going anywhere i can even flip bow upside down the arrow isnt budging,,, once you draw the elastic comes off arrow,,,,,,this is the best i found. same as toothpick trick but my way everything stays on bow and imposible to forget.
the style denny sturgis jr uses looks pretty good too