Meru,
Since you are in Melbourne, why not have a look at this post..
http://www.iceinspace.com.au/forum/s...ad.php?t=45366
Trevor "OneOfOne" could make an extension for you - you just have to measure the bolt that fits into the end of the counterweight bar. I have a HEQ5Pro and it has a M6 bolt in the end of the bar.
I could make one too, but Trevor is nearby.
-John