I've heard some folks mention using carbon arrow shafts for toggles, and it so happens I work in a sporting goods store that cuts arrows to length.
I snagged a couple dozen pieces in the 3-5" range that are from arrows with a 60-80 pound spine. About the heaviest they make. How long are toggles typically? I could get hundreds of them in the 2-3" range. The longer ones are a bit less common.
Are these arrows suitable, at least for smaller guys like me (Under 175lbs)?