BSI central locking again

Rather than resurrect an old thread, after about 18 months of no central locking I spotted a BSI on eBay and have decided to have another look. I read that the top board in the BSI is nothing to do with the part which is programmed to the key so I am going to try putting the top board of the eBay BSI onto the bottom of the one out of my car. Much huffing and puffing later and several profanities I finally got the boards separated using of all things a thin wood chisel as none of the proper electrical tools would touch it so now I have a BSI in bits and in a bit I am going to go out and pull the BSI from the car. Hope this works.