Other option (if you have corrugated foam rather than a cut-out layer) is to cut a couple slits in the bottom piece of foam and then run a strip of 1/2 or 3/4" wide velcro through so you can strap the bolt down. Same method as they use to strap bows into hard cases. If you're worried about it tearing the foam you can reinforce it on the back side with come cardboard or 1/8" hardboard panel.
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