You can replace the clock motor for $16 ...
http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=Wh40&op=search&Ntt=Wh40&N=0&sst=subset
... but if the mechanical timer mechanism is worn out, then that is not repairable. To check mechanism, lift timer dial and rotate tripper pins out of way, then click manual override on-and-off >> if override works fine, and lights come on then motor is probably the problem.
If you buy a new T103, the insides might snap right into old timer box without needing to replace the box. To remove insides, depress retainer spring located at top, tip out timer, and lift to remove. New timer has 4 tripper pins. Save old tripper pins, and tape them inside box.
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