Hi, I've very recently (3 shaves ago actually) acquired a really nice Fat Boy which has given me nothing but DFS shaves. I'm very impressed with it, and compared to my much more aggressice Merkur 38C, this Fat Boy is like a little sports car. I usually shave on setting 3 or 4, and only had one tiny nick on my neck so far (down to me rushing it, no fault of the razor).
Anyway, I've noticed that whilst in use, and whilst giving it a 'shake' to dry after the shave, that the TTO knob at the end seems to want to 'undo' itself, only by a few degrees, and even though the blade is still held in tight, the TTO knob isn't as tight as I'd think it should be.
It closes the butterfly doors fine, and then I get the further 'quarter turn' of tightening. However, it seems to want to 'untighten' - only a few degrees mind.
Is this normal? How tight should the TTO knob be with a blade inserted?
Maybe I'm just being paranoid that my lovely Gillette isn't working as it should?
(It's a 4th quarter 1958 (D4 code) by the way, and the bottom of the TTO knob has the 2 indents so if required I could dismantle it.)
Many thanks in anticipation of your replies.