Spoke lengths for SON XS on a Brompton?

[rogerzilla]

I seem to remember that a Brompton front wheel can be taken apart and the hub replaced with a SON-XS while re-using the spokes, because the SON-XS happens to require the same spoke lengths (in its x2 pattern) as the standard Brompton hub with its radial pattern.

Does anyone know if this is true?  If so, I might get a SON-XS and rebuild the wheel while it's still new - the standard front hub is pretty indifferent, and I'm going to want lights. 

I didn't specify the Brompton lighting kit because (a) I'd rather build my own wheel and (b) I don't want a wired taillight or an incandescent front light.

Incidentally, there's a good series of YouTube videos where a (probably obsessive) Welsh dude disassembles his new Brompton to check it over and ends up adjusting and greasing all the cup-and-cone bearings, which are pretty tight and dry    Spoke tension from the factory is notoriously poor too - most people seem to break spokes within a year or so of new - and I'll tighten them all up.

[Mr Larrington]

Schmidt's webby SCIENCE, he say:

For the current Brompton rim 349x19 (available since 2005, wear-indicator groove at the sidewall) with 28 spoke holes 148 mm long spokes are recommended, mounted 2 cross not interlaced. For radial spoking use 133 mm long spokes. Older Brompton rims (marked “Alesa”) need spokes 2 mm longer.

Measure twice, cut once?

[rogerzilla]

Thanks.  148mm is, serendipitously, the standard front length, so I'll just pull the wheel apart and rebuild it before the spokes get too set in their ways.