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Yeah I saw the tool but to me seemed a rip off.
I'm annoyed I didn't figure they would stretch more than the race/comps I'm used to. I ought to swap out the 12 DS spokes for 2mm less so I can get those last few kgf of tension, but already so much $$ and not enough energy. Unless anyone fancies 12 x 286mm black cx ray spokes...
Hovis-
The Sapim tool is pretty cack... I have it and the slot is nearly dead and I don't build CX rays very often... I doubt it's seen more than 500 spokes in its lifetime. I bought the DT swiss one, which only works for 0.9-1.1 mm blades and combined with the DT spoke key... it's made of hardened steel and should last a couple of decades... a bit slower to use, but holds the blade nicely, all the way to the thread, rather than just a couple of centimetres far away from the thread like the Sapim one.
A slot in the wood works just as well for a single build... in the long run it will get too loose and you'll need a new one.CX Ray do stretch a bit, just like Laser, maybe half a millimetre, not enough to screw the calculations, which were probably wrong in the first place
ugosantalucia
There is a Sapim tool for that, but it's just a bit of plastic with slots in it. It does have the benefit of no splinters and a slot for CX (& DT New Aero, although presumably you're supposed to buy the DT spoke holder for those) on the other side.
The stretch should be the same as Lasers/DT Revs. It will be quite a bit more than Race/Comps at the same tension as the cross section is about 30% less. AFAIK, the DT spoke calculator allows for this, which is why it has a field for spoke type.