Many thanks again, Be.eM, for the reply.
I'm living in the US, and I've submitted a request for a quote on that spring.
I'm using .008 for three reasons.
1. Steve Beato's "Size Matters" youtube video.
2. I read somewhere that Allan Holdsworth used .008 on his headless guitars.
3. I have a touch of arthritis, and .008 are easier to play.
In spite of all this, when I tune the Steinberger without locking the bridge, it seems to stay in tune just fine, anyway.
;)