There is a small screw accessed through a hole on the underneath of the right bottom section. Fully loosen this, it will not actually drop out , then push the timer unit up and it will slide out. Behind is a fixed face plate with the wiring and contacts. The new one slots back onto this , easy. If its the clock which has stopped you can maybe slide it out as above and WD 40 the mechanism from behind, this worked for me.
Graham Jones, September 2008
