I have to suggest Jon Goodman as well.
All of his stuff is excellent, and he is a great fellow as well.
And John is an APUGian, too.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.
BTW just replaced the foam in my F2 mirror box and removed the foam from the back. Don't think it needs any foam or thread.
Does anyone know how they came from factory?