Yes, Brian the 7L....the 7D is the big carb from the FSR series.

Pic #1....The lower hex head holds the assy in the carb and acts as a guide.
The allen fastens the arm to the center portion, and my mistake....it doesn't
have to be loosened. The top screw (concentric) when turned left or right
moves the arm which is fastened to the center brass portion by the allen
Rocking the center brass piece left or right makes the adjustment.

Pics #2, 3, and 4 are the 7H carb, which is similar to the 7M carb. I have
never seen the 7M....but I have most of all the others on OS engines. This
is one of the few with the mid-range adjustment....the only one I have. This
one has a strange throttle arm on it. I think it was a helo engine, but I'm
not sure.....it's on a ringed .61 FSR engine.