Kewl - I might just try that. I think removing the cowl is still permitted under 'warranty'.

I've read on other threads that Customs use pretty powerful stuff these days and whatever they do might stuff the magnet up. After all, ye olde Hall Effect requires a correctly polarized magnet for it to be able to sense the pulses.

I'm a bit reluctant to open my Turbine in any way at the moment though - if I do something wrong in doing so, I can kiss any warranty goodbye...

BJ