Steve,
The lockdown bar will be tough finding in Australia (where the hell did they all go?).
Might be best to try finding one on US eBay (none at the moment just checked). Try posting on RGP or www.mrpinball.com - both free ads.
PBR sells them - http://www.pbresource.com/lockdb.html
If you can wait I will have some complete score units in the next 4 weeks.
That's your best option at this stage - unfortunately.
