Best way to make a cord opening in mesh?

I just got the chameleon a new aluminum screen enclosure, and I am looking for the best way to run the electrical cord for his waterfall out of the screen without having a large area around the cord for crickets to escape from. The opening in the screen must be large enough for the end of the cord to fit through (the part that actually plugs into the wall), but this leaves a large area around the small part of the cord once it has been put through - there is no other way for the cord to go out of the cage except through the mesh. I also want something that will be easily able to be removed and put back on for regular cleaning. I have been to the local hardware stores and electrical stores, and they only seem to have large metal contraptions that would be too heavy and bulky for the cage.
I don't know what exactly I am looking for, or if it would just be easier to rig something up myself - so I would really appreciate any ideas or experience of modifying screen cages

Thanks for the responses

The only thing I worry about cutting through the mesh in a T-shape is how well the mesh would hold up over time with the cord going through it all the time - would it become frayed? Or would there be a way to reinforce it somehow to prevent this?