If it's alu it should be much easier than you think. I may be shot down for the idea, but don't discount brute force - using a large nail and hammer, onto a piece of wood underneath, depending on the thickness and your strength.
Edit: 1.5mm ... you can probably make the hole with your teeth.
Yeah, I was thinking about punching a hole through it initially, and then using the drill to bore out the hole, then use some files to smooth out the edges.
If it's alu it should be much easier than you think. I may be shot down for the idea, but don't discount brute force - using a large nail and hammer, onto a piece of wood underneath, depending on the thickness and your strength.
Edit: 1.5mm ... you can probably make the hole with your teeth.