Not possible ,if i push the blades(even if i do really hard)not closing ,i can close pushing the sides of the ring but for that i need two thumbs which isn t possible when the watch on the wrist.Tge only way to close it a hard push onthemid of the cross!
My 3940 has a rose gold clasp that is noticeably lighter than the yellow gold one for my 3970. I think if the curve of the clasp and its position on the strap do not line up well with the shape of an individuals wrist, it will be less comfy. Lotta differe...