Actually the 24" stepped down to .187 is out of stock but there are a couple of 30" ones available.
I need to grab one of the straight 1/4" ones myself. I want to try the cut down S270 on my cat but the 1/4" shaft I have is about 2" too short to run in it.
BTW that is a killer looking servo. If they're still in stock after you get yours I may have to grab a couple myself. If that was a JR it would be about $100.00 higher with it being coreless.