I've just disected "Barabel" for fitting the chip. Unlike my earlier one, I removed the motor so as to take out the cap. By doing it this way, all the Hornby wiring can be removed. The black wire to the L/H pickup is tight for getting the iron in,but,with care, it can be done. I'm using a 25 watt Antex with a small bit.Another thing I found was that the motor wires had huge lumps of solder holding them on and the metal front motor mount is very close to the brushes,with a risk of shorting. In order to give me more clearance I'm going to slim the mount down tomorrow. DCC chips don't like shorts. One tip that may be useful when undoing and replacing the tiny screws is to either stroke the screwdriver on the motor can or put a small rare earth magnet on the end of the screwdriver. Either method means that Isaac Newton's law doesn't work. And we all know that small screws like the floor don't we.