Ti frame - stripped BB cup

Slightly off topic but also related, I'm getting a creak from my drive train when pulling away quickly and stopping. I have an aluminium BB cup and when I've been re-greasing to try and solve the issue I noticed some of the thread on the end of the bb cup had broken off. Could this be causing the creak? Where can I get a steel bb cup from?

For starters DO NOT RIDE IT ANY MORE until it's checked out.