Just got my set in the mail.
I have only been able to sharpen a small kitchen knife.
I am brand new to the WE. I have the WE130 portable since XMas. Sharpened probably 2o knives.
From my limited use, I really the bumps. They are adjustable so you can maximize the stroke of your stones. They reduce and soak up any stones that hit the bottom end stroke of the base of the rod with ease. Colors are black and blue I was sent and like them.
I am very happy with this product. They are very tight which is a good thing, but will need 2 hands to install and/or adjust height.
When I get a few more knives done, Ill post another update.
Great job Airscapes.