Third paragraph down might shed some light -
http://www.team.net/html/spridgets/2.../msg00406.html
That page also threw up an interesting link to a long-dead motoring programme I'd never heard of, which might also be of interest to Sammio (et al) builders. You'll notice that Triumph didn't use wires on the Le Mans Spits (also check out the paint finish on the Ferrari wing badge at about 4m15s in, especially if you think you've got to pay a pro a fortune for a 'quality' spray job to get a convincing period look on your 50's racer instead of doing it yourself on the cheap) -
https://www.youtube.com/watch?v=mo4_yar0joQ
Enjoy...