The clock dial on my grasslin analog timer does not correspond to the time on the "2:00" arrow. how do i realign the clock dial to be in line with the arrow?

Dial clock ... experiment by rotating dial clockwise several times to see what turns on-off.
Step by step for analog timers on following link
http://waterheatertimer.org/How-to-set-timers.html

Gene

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Copy following link for setting analog timers by experimenting with features:
http://waterheatertimer.org/How-to-set-timers.html

2) Betacom timer is ordinary 24-hour grasslin analog timer, with moveable trippers located around outer edge of dial, and 3-position switch.

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1) Ariston 999599 is ordinary 24-hour FM1 analog timer from Grasslin.
http://waterheatertimer.org/How-to-set-timers.html
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#FM1

2) The timer dial rotates around each 24 hours, and pins are pushed outward or inward to set on-off times, and are dependent on wiring and position of override switch located on front tof timer dial.
Copy following link for setting analog timers.

3) After opening links above, add comment and attach photo of your timer.

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Reverse wires on terminals 3 and 4

1) GP24 appears to be 24-Hour version of Greenbrook T100 series mechanical timer, with Grasslin analog time dial.
http://waterheatertimer.org/pdf/Green-brook-T100_CInstructions.pdf
http://waterheatertimer.org/How-to-set-timers.html

2) If clock is not rotating, then probably your wires are reversed.
Reverse wires on terminals 3 and 4.

3) Power from Mains, and wire to Load each have 2 wires.
Hot live from Mains connects to terminal 3
Neutral from mai9ns connects to terminal 1
Neutral going to load connects to terminal 1
Hot going to load connects to terminal 4

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Replace timer.
Copy following link to identify timer
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#KM

If analog timer starts hanging, then motor is probably getting weak.
Use air pressure and blow out timer while rotating timer dial.
Turn power off and spay bit of highly flammable vapor from WD40 can while rotating timer dial.
Timers generally have 1 year limited warranty.
Replace timer.
http://waterheatertimer.org/How-to-wire-timers.html

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1) Question posted under Woods 59017 analog timer.
http://waterheatertimer.org/Woods-timers-and-manuals.html#59017

2) On the Woods 59017, the 'arrow' or triangle is a hollow triangle shape on inner timer dial. It points at the 3:00 position.
Manually rotate dial until current time lines up with arrow, arrowhead, or triangle.

3) On other analog timers, the time-now 'arrow' is usually small dark-colored triangle or arrowhead located on stationary part of inner dial.

4) Open following link to see how to set and use analog timers by experimenting with each feature.
Plus images of time-now arrowhead or triangle.
http://waterheatertimer.org/How-to-set-timers.html

5) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

I have GM40 timer sitting in front of me.
I cannot understand your question because I do not know what the 'control shaft' is.
If you mean the black-colored FM1 clock dial with captive trippers, then this dial is supposed to rotate continually as long as timer has power.
http://waterheatertimer.org/images/FM-1-Grasslin-Intermatic-20.jpg

Grasslin/Intermatic GM40 page
http://www.intermatic.com/products/grasslin/electromechanical%20time%20switches/multi-voltage%20time%20switches.aspx
The manual says quote:
With the manual switch in the middle position, the GM40 is in automatic mode and will switch at the programmed times. In the upper position "I", the load is permanently ON. In the lower position, "O", the load is permanently OFF. End quote.
In any switch position, the FM1 clock dial will continually rotate.

If your Load does not turn on-and-off according to the trippers set on FM1 clock dial, then 1) wiring is suspect or 2) if dip switches are not correctly set before applying voltage, and timer could be damaged.

The timer arrives with dip switches pre-set for 277Volts.

You can also manually rotate clock dial clockwise to observe when the load turns on-off.

Add a comment and give more information.
I would like to know what the 'control shaft' is, and what voltage you are using, and what dips switch setting you have, and which wires are connected to each terminal.

pins IN = timer ON
pins OUT = timer OFF
Slide-switch must be pushed to right for timer to work
If dial is not rotating, wiring is incorrect (see below for wiring)
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Grasslin and Paragon both offer multiple-gang timers.

Grasslin manual says:
" For example, to turn lights ON at 5:00pm and OFF at
11:00pm, leave inward the 18 trippers between 5 and
11 on the "pm" side of the dial.

Link to Grasslin manual

Wiring timer:
Timer black goes to Hot wire
Timer red (or blue) goes to Load
Timer white goes to Neutral (if no neutral, then connect to bare ground)
If timer dial does not rotate, black and red wires are reversed

The Grasslin analog timer works same as GE 15070
http://waterheatertimer.org/GE-timers-and-manuals.html#15070

You can also download Grasslin manual:
http://www.intermatic.com/products/grasslin/electromechanical%20timers%20and%20timer%20modules/in-wall%20timers.aspx