I'm the person making the things....but it's slow going at the moment.
After the initial test we decided to modify them for more revs (and I've also made another set using a differant design), but as I presently have no bike to fit them to, they remain half finished and untested. The problem is I have no car licence and Andy has little spare time, so between us things have dragged on a bit.
Ideally I'd need my own bike as a jig, but not having a car means finding one is a pain, and I'm not exactly made of money either......