[ginettaman]

I cant get a 2.0k resistor locally, nearest 1.8k & 2.2k.

I want to get 24v out of my steps, so if my calculations are correct I'm better to use R3 100ohm R4 1.8kohm which should = 23.75volt
With Vset adjustment I shoud be able to get my 24 Volt

Please tell me if I'm wrong.

 

[tangent]

That is indeed your best choice, unless 24V is a hard ceiling. Due to component variances, you might get more than 24V minimum out of this. If 24V is a hard ceiling, you should ask yourself if you absolutely have to hit 24V, or if, say, 22V would work just as well.