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Snag knots are your friend.

They allow quick band/tube changes.

The Boynton-Banger has shot an 80 grain (5.2g) marble at 234 fps.

Incidentally, you can reverse the rifle and slide the fork instead of the trigger.

The bands are attached to the fork by simply wrapping the nylon around the 1/4" bolts.

The snag knot and the bolt wrap allow for perfect rubber length adjustment.

 

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I've been waiting for you to do something like this! Thin bands (probably tapered) combined with a long draw for max velocity.

You should experiment with different weight shot and plot a mass vs. velocity curve. You'll be able to extrapolate the unladen band weight and find the best trade off of KE vs Velocity.
 
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