It's a good idea. I have also seen them on eBay.
Does yours add much weight?
I bought mine which isn't PVC but aluminum off eBay and it is definitely a big difference in weight when your swinging a coil for over an hour.
I'm working on how to make some parts plastic to lighten the weight.
I got this one: http://www.ebay.com/itm/whites-fish...111?pt=US_Metal_Detectors&hash=item2ec0bf066f
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