It's not a very critical value. I'm sure 7k9 will be fine.
Please tell, where on earth did you get 7k9 from? A most obscure value.
FWIW, I never let my 10k drawer get below 20. Possibly the most commonly used value.
Amen, BB, a handy size. In fact, when modding a RC transmitter that did not have end point adjustments (EPAs) to fit a specific ship, I replaced the 16.8k potted joystick (acting as a voltage divider) with a 20k slide pot. To restrict the servo to the range desired, made a quick guess that 10K should be close (well, actually tried it out with another pot as a variable resistor to find the basic "range"), and it seemed 10k would bet me pretty close, so I tried them. Turned out to be dead-on perfect! Of course, this was one part good guessing and 99 parts luck (or a case of the Good Lord looking out for fools like me and granting a small miracle), but, regardless of the explanation, the 10k was handy and worked a treat. And, for tying pins high, etc.
I try to keep several 330R, 1k, 10k, 100k, 2k2, 22k 220k, and 4k7 as the minimum in my little Picaxe playbox (a large fisherman's bait box with breadboards, a multitester, couple o' battery packs, various actives and passives, and, of course, picaxes).
Cheers,
Wreno