Why not try some new technology to solve the problem.
Take off one of the good ones and have it 3d scanned. There are a number of 3d scanning services in the Sydney area.
Not familiar with 3d scanning, here is a segment from Jay Leno's Garage:
https://www.youtube.com/watch?v=n60NibYbPqQ Then you can have the resulting model sent to a 3d printing service and make as many as you would like. One of the nice things about having a 3d model is that you can send to anyone that needs it.
Here is another clip from Jay on Direct Laser Metal 3d printing:
https://www.youtube.com/watch?v=bwFspzVGUF4 Objective 3D in Melbourne offers printing services
www.objective3d.com.auThis Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=209315