I don't think its a Will Burt here's a link to Will Burt's timers http://www.willburt.com/manufacturing-s ... re-timers/
You probably would be better off if you figured out what is wrong with your timer.
Does the clock motor turn?
If the clock motor turns but it doesn't turn on the stoker then either the micro switch or the relay is shot.
If you can turn up the thermostat and that turns on the stoker then you know the relay is good and the micro switch is bad.