A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
I recently came across the image above, at the link above - one of the things that caught my eye, is that the bush in the image is a bright yellow polyurethane bush and apparently have a metal outer sleeve, the bushes I received (purchased through a US supplier) are not the same, mine are black, I assume polyurethane, and have a thick plastic sleeve, which matches what I've seen in at least one YouTube video (out of NewZealand)