Hope someone can help me. Have a mechanical timer for heating(a clock like dial that turns 24hr.) which has broken. It has 2 on clips and 2 off clips, and a day of the week dial. It also has a switch (on/timed/off), and thats it. It doesnt have a seperate setting for ch or hw, it just is all on or all off. Problem is that the only marking is "AMF Venner 5/73, which i assume is the make, but I cant find one anywhere to swap it over. I just want to change it for one that works, and therefore use the existing wiring to swap it over. Has anyone heard of this make, and any idea where i can get one. If not is there another make which i could swap it for to use the existing wiring (as you can tell i am not an electrician). Any help would be much appreciated