They are thru-bolted, but on that newer, well-kept V21 they should back right out ;P It's a long reach, so a 2nd set of hands will definitely help, but I extended my deep well ratchet with a piece of PVC so that I could wedge it against the inside of the bow and hold the bolt while I turned the screws from the topside. Worked out fine and I think I only had to drill out two.
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