Originally Posted by Air Head
This new version without the c-clip notch is much safer as the shaft is the full 8mm (not 6.5mm like it was where the notch is cut). This and the new blades that Tom Cook made (improved blade material) make this the safest version we have sold to date.
No, there is no 'problem' with any version we have produced (we have never had a single fan system come back, and we have sold hundreds of them). We just keep making it better with each new batch. Tom improved the blade material prior to our last batch.