Here are 2 different types I have. The 2 broadhead covers (made by Art Butner aka. artcher1) attaches to the upper limb with a short piece of shock cord and you hold the arrow shaft between your bow hand and the back of the handle. I use these on my selfbows...
...this other one attached to the limbs, one for the broadhead on the top limb and the other to hold the arrow shaft to the bow on the lower limb. This is commercial made but I don't remember who made it. Maybe Don Ward...