Hi Zip439. Many thanks for your post. First of all, and BEFORE I read your post.....I tried the adjuster shown in my photo above, using an Allen key inserted into the top of the adjuster There was very little resistance when turned in either direction and I am not convinced that anything actually moved (fortunately!). I suspect that it's either broken, or was disabled at the factory, given that it is intended for HORIZONTAL adjustment. Moving to the VERTICAL adjustment, I can find no other adjuster! I have seen the adjuster to which you refer in other posts/threads, but there isn't one on my car. Perhaps THETESTER can comment here, given that he appears to have a car similar to mine - RHD coupe. With reference to my new photo below, with rubber cap removed for clarity, there is a HOLE to the left of the "Allen Key/Horizontal" adjuster. Maybe that is where the VERTICAL adjuster should be?