Ignition Immobiliser

One of the great things about building a car like the Birkin, is you join a community of like minded people, who participate in the build process with you by either offering assistance (spilling blood in the workshop), or advice and feedback. A fellow Birkin owner, Maurice sent me some ideas the other night that I was able to incorporate into my build and solve a problem I had yet to confront.
The Passive Anti Theft System (PATS or immobilizer) coil is a black plastic ring that fits around the ignition barrel in the Focus. It is wired back to the dash cluster and ECU, and it reads the immobilizer code in the key and allows the engine to start. The issue here is that I have added an aftermarket ignition which is much smaller than the PATS coil. I had considered mounting it somewhere else under the dash, or behind the centre console, and then just touch to key fob to it as I start the car. The problem with that approach is then I have to have the two keys separate which means I would ultimately lose one. 

Maurice's solution was elegantly simple and very effective. He suggested using a thin aluminum sleeve with a cut through it, fitted over the ignition barrel. The PATS coil is then fitted over the aluminum sleeve which gives a snug interference fit, and allows the PATS coil to sit flush with the ignition barrel. The whole thing is then tightened together using a stainless steel hose clamp. Great solution. Thanks Maurice!