Ok, cool. Thank you Stephen.

Can I lock them open by adjusting the pulley on top of the servo to half way between the hi/lo positions for a good indication of half open? I'll then uplug it from the loom.

I've got the RC valve setup pages from this website bookmarked but I think I'm going to find it difficult to actually set them up given that my servo has no action at all. It won't do the movement at 2krpm like the manual states...