Open following link for setting Intermatic/Grasslin FM1 timer setting instructions:
To set the 24-hour analog timer, you need to move 4 consecutive tripper pins for each hour of run time.
So for 6 am to 6 pm, 48 trippers pins will be moved outward and 48 inward.
http://waterheatertimer.org/pdf/How-to-set-Intermatic-FM1-timers.pdfOpen following link for Intermatic FM1 series and PB series modular timers with wiring, manuals, model numbers and instructions for setting.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#PBAdd a comment for more help
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