Sherman Pistol Port Handle - Dimension request
 

I'm reaching out to MLU members for some basic dimensions of the Sherman Pistol Port handle, so that I can make a non-working replica out of wood, metal and/or plastic tubing.
Attached is a drawing showing requested dimensions. As these handles were similar in all Shermans a few key dimensions would be greatly appreciated. Even if I can get the correct diameter of the pipe that would be a big help, as I can scale the drawing from that point on. Ideally I am looking for A, B, D, and E dimensions to get me started.
Photos of the locking mechanism would also be incredibly helpful, as this illustration is not perfectly clear how it actually works.
Many thanks in advance,
Patrick