Here's a bit more info:

http://www.eschoder.com/english/english-Geschichte.htm
Schoder ceased production in January 2013, no idea if any parts available?

Books that may or may not have helpful info?

1. http://www.amazon.com/Mannlicher-Military-Rifles-Straight-Designs/dp/1931464146

2. http://www.amazon.com/Walther-Mannlicher...her+w.+b.+white

Rare are M-S parts to find these days, always has been difficult finding parts.

Opps....just noticed you're in Australia, so phoning Tom Tomkins isn't too practical!
Just keep sending him emails?

The Mannlicher Collector's Association situation: usual way is to join the association, then post a wanted ad in their newsletter. A bit slow this way, but it is a potential way...

hope ya the best,
awanderingbear