Hi Basement,
I assume you're trying to heat form rubber tubing and your idea might work. I've used stiff solid
core wire ,like 8 or 10 ga inside it, heated it in the oven at about 250-275 degrees for about an hour
or so and had it hold most of the bend. It did relax some after removing the wire when it was cooled
down to room temp. Never tried the heat gun idea though, which might work even better if you're
patient enough not to "rush it" !! :thumbs: Jeff