Soak in hot (very hot?) water for a while, again with something heavy, but not too heavy, to hold it straight as is cools down.
Im afraid it might bend even more when i put it in hot water
It shouldn't bend more. I'm guessing this is a PBT space bar since you said it was from Vortex.
- You will need to get the water nearly boiling (more or less a simmer) or until you start to see heat bubbles rising from the bottom of the pan.
- Soak it in there for 15 to 20 seconds.
- After that lay it on a clean flat surface and rest the heavy(ish) flat object on top of it.
On the thicker PBT space bars I've done this on it has taken a couple of times. That's why I use a hair dryer while the heavy object is on it. Seems to work better each time I've tried.