I would make a prop drill, not bring a real one.
They're not going to want you to have anything sharp, and it's a liability not only to them, but to you - what if you trip and fall or get pushed and someone gets stabbed or whatever ?
You could potentially gut a real drill and replace the bit, but I think it would be easier to make it from scratch ! I love doing things like weathering and blood spray so that would be fun if it went along with the costume (bloody drill and clean costume might be odd).
Disclaimer : This post written by a Grumpy Old Man
Actually in the pipes:
- Remaking Ser Loras doublet.
- Luke Skywalker, A New Hope
- Wind Waker starter costume in swim material
Eventually: Paul from Dune, Faramir, Harry Sullivan