Speedmaster Winding Noise

I bought my 3861 Speedmaster new in late 2021. I wind it fully every morning and it is keeping perfect time. Just recently I have noticed that when winding it, as I reach full wind, on the last turn of the winder as the resistance to turning builds, there is a faint 'creaking' noise. It is as if the main spring creaks as the coils fully close. The watch is only 18 months old and working flawlessly, so I don't want to be sending it away for service just yet, but can anyone (Archer, perhaps?) assure me that this noise isn't a sign of anything seriously wrong?

Thanks in advance.

Stan.

Thanks, everyone, for your reassuring replies.

Stan.