| Well being the only one here to have actually used them I can clearly provide the evidence that it worked, though being a senior design engineer I have also looked at the product in detail and my findings for the cost reduction are in line with the product. it is a lower cost based product through materials and finish.
I fully agree with the fact that others are charging more but this is the way with everything in the world, hence items from china are lower cost than here - most materials I spec from china always seam to be of a lower grade unless we state BS or an ISO.
Try this one, support your country and pay a little extra to keep some here in a job... dont buy the copy buy the original. (my niggle)
If you want to know the actual cost to produce the pulley drop a post and I will get it quoted in the UK and some easten country and show you the "real" cost | 
