Serious question about steel chasity devices in regards to ball size

My Lady wishes to lock me up in a steel device. However, I have a small penis (5 inches fully erect) but my testicles are very large (larger than golf balls). We bought a gates of hell device, but because the ball ring does not open up, we could not get my balls through it. I am looking for a metal device where the ball ring opens up to allow my testicles in and then snugly close the ring around them. Help?

I rang the guys at maturemetal and the helped me out. Great devices great at helping customers out.
Droopy and Miss