In my experience, there is a "sweet spot" I the adjustment of a JLD. That applies to both guitars designed for them or not. Too tight and you end up choking the top. Too lose and you risk rattling parts, or structural damage to the guitar top. They can be adjusted but they need to be snug at a minimum. And yes, by adjusting them you can (effectively) tune the top. Whether that tuning is useful or not is up in the air.
Ed
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