I am interested. will it help sprocket alignment problems? how much is it and where does it ship from. what dimensions or data do you need? (Jerry)

The sprocket is attached to a bearing (bi-directional freewheel) which is screwed onto a boss such that the wheel axle is the centre of rotation of the bearing.

The sprocket is fastened to the freewheel teeth and the only sideways play is that within the bearing itself, which is minimal.

This Q&A was found on HybriPed : http://www.hybriped.com.au/main/modules/smartfaq/faq.php?faqid=2