You could make what is called a hot knife with some resistance wire of suitable rating bend it into shape you need to make the rebate and make a holder that will allow you to move it along as it cuts its way through and gives you the depth you need in the foam. It would give yo a nice cut, hardly any mess and would be quick to do it. There are videos on You Tube about such things if you want to go that route. It would be wise though to use it outside and wear safety equipment while doing it, like breathing masks and shields or glasses etc.Thanks for that...I am somewhere between routing it with a vacuum cleaner attached, and making a hot-wire cutter...and hand rasping it...
Hi patsstuffnow, thanks for trying to help but you've posted a link to an unrelated (and not useful) product.
I've capable of doing online research and have explored several options, and only found companies that sell large quantities (and charge ~$100 for delivery regardless of quantity), rather than the one or two boards I require. I'm unable to pickup myself from the locations on the fringes of Sydney due to work commitments.
Hence my request for recommendations from members here who may have purchased it recently, since Bunnings was the simple option but no longer stocks the product.
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