Sherman tank: pistol port locking mechanism - photos wanted

[Patrick Johnson]

Hi,
I am hoping someone has good photos of how the pistol port handle rotates into a female retainer welded just above the pistol port opening, when the handle is in its locked position. Given it's such a small part, the photos I have just don't give enough detail to its construction. Sketches would be fine in the absence of a decent photo.
Many thanks for your help,
Patrick