here a trick I worked on. ( so far it works great) run a bead of liquid nail on both sides of the flexwatt ( on the wood) this will act as 2 things a spacer and a guard for the flex so it not rubbed. It will just take about a day or 2 to fully dry and once does workes great( the bead can be as about 1/8 in and let proper air flow too.)
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