Good luck with yours! I used a standard upholstery nail. You'll want the nail to create depth in the headboard, so the foam will really have to be pushed down.How to make your own custom headboard with an individual nailhead trim. It's custom shaped upholstered headboard.
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I left the side panel near the mechanicals just pinned. This way I can pop the side off for the bleed. I control the temperature at a main thermostat so I only need to get at it once a year.
Thanks for watching.