I get lines towards the middle of the channel.. Went through about 3 or 4 blades last week.. Should of just thrown £25 out of my van window instead of buying 2 of them channels.
I won't be buying any of moerman stuff again last month we had around 10 faulty blades aswell. Some were to short which should of been 14" and some had rough feel on the rubber which passed water on glass.
Moerman you can do one mate 😄