I've been using the bow spider lately instead of lashing it to the back. Seems to work fairly well and not noisey, bit of a pain to put it in at times, given that my right shoulders a bit gimpy. The price is a wee bit high for what you get though,but it holds it rock solid and seems to be doing the trick.
I Looked at various slings, just wasn't a fan of them and the bow bouncing around on my leg/etc, just seemed like I'd knock the sight into something, granted you could probably do that with the bow spider to.
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