Quote Originally Posted by RangeRover View Post
Okay...I'm intrigued. Tell me more.
Sorry not to have replied before. The windage adjustable leaf I showed was BSA's commercial use variant of the model made for the WD which had no 'knob', but had a spring that retained the leaf in whatever position it was set to. A pin was inserted in a hole to release tension on the spring and from there it was a matter of shoving it over as much or as little as you guessed was necessary.

The BSA variant took some of the guesswork out. IIRC, each number on the 'knob' or dial was 1 MOA of adjustment.

I have one of the WD pattern ones here and next time I come across it I'll take some photos.