I had my son machine a 20mm thread into the collar of my EQ6 and then purchased a 25mm(actually 1") stainless bar which he cut a 20mm thread onto the top and made a retaining foot to thread into the shaft at the bottom and bored the weights to suit. It is also longer and it is just awesome.
Before you all rush off to have one made etc, Orion sell an upgraded shaft that is worth thinking about. I have not seen it here in Aus, however you could still import one cheaper than paying a fitter and turner to mod your set up.
http://www.telescope.com/Orion-Count...t/p/102787.uts
Regardless of how you do this and not taking anything away from the OP, it is a worthwhile upgrade.
