Would you recommend this website above all other Australian spare part websites pinsanity?
It does seem like a fairly well-maintained site with lots of parts at decent prices. I've just gotta decide what else I would like from there!
I managed to fix the multiball problem! I loosened a screw holding the switch in place and then made a minor adjustment to the positioning and viola! Multiball is fully operational!
Thanks for the help guys, especially regarding the plunger and that red spring I'll need to buy!