Making a 25k pot

[piltdownman]

I know there is a way to use a resistor to create different value pots.  Is there a formula to follow?  I don't have any 25k pots and I seem to need a number of them.  Can someone lend their expertise?  Thanks

[boratto]

http://www.diystompboxes.com/smfforum/index.php?topic=90931.0

[piltdownman]

Thank you, boratto