Cool. You're welcome, apology completely accepted. Now, as I said before, the regulator may not meet its full specifications at 24V. The components (specifically, the big inductor) were chosen for an output voltage range of 35V upwards, and it COULD make a difference. Things you should check for are:
1. The regulator may not regulate accurately with no load, or a light load. Put a load of around 1A on it, and check that the output voltage is still 24V or very close, and adjust the trimpot if it isn't.
If the voltage is too high with no load, or a light load, and if this will be a problem, you may need to add a resistor to permanently load it down enough to keep it in regulation. This resistor will waste power and will get hot. Let us know if you need to do this.
2. The regulator may not be able to provide its specified maximum current. Check that the output voltage stays in regulation at the maximum load current that you want to draw from it. If the input voltage comes from a battery or other variable voltage source, do this check with the input voltage at the lowest limit, i.e. the lowest input voltage that you will be using in your application.
One more comment.
Usually, when you have a resistor and a trimpot in series like that, the values are chosen so that the resistor is the largest part of the total resistance, typically around 80% of the total resistance needed, and the trimpot provides the "fine adjustment".
In this case, the total resistance you need (trimpot plus "R1") is about 6.5 kilohms, and it would be more appropriate to use, say, a 5.6k resistor and a 2k trimpot, which would be adjusted to about half way. This ensures that (a) the voltage can be set fairly accurately, even with a single-turn trimpot, and (b) it's not possible to adjust the voltage a long way away from the desired voltage of 24V.
At the moment, it's the other way round - the trimpot provides about 80% of the total resistance.
In this case, the trimpot is a multi-turn one, so you can adjust the voltage pretty accurately, and reason (a) doesn't apply, but reason (b) still does, and it's up to you whether you want to change the components so the adjustment range is limited. If you do, replace the trimpot with a 2k one, and replace the "R1" resistor with a 5.6 kilohm one.
Alternatively, if you just want to tidy up the mod, you can remove the tacked-on parallel resistor and the 10k resistor underneath it, and replace them both with a 1.5k or 1.8k SMT resistor.