Thanks so much Bill.
I'm paying attention to two products, don't rush.
You were very helpful and, as always, kind.

Alessandro.
Hope the attached picture helps.
Available from Howes models.
Regards
Bill

Thanks Graham93.

It's the same link that DuncanP gave me yesterday in this topic:

https://model-boats.com/blogs/124291

They are still available - you just need to know where to look 😀

Manufactured by Kingmax and available in two options 4 turn or 6 turn. I have used several of these in my sail boats.

Try: https://www.componentshop.co.uk/55g-sail-winch-servo-4-turns-end-to-end-travel.html

I'm afraid that this type of winch is no longer available, I hope they haven't stopped producing it.
From a recent message from DuncanP on his build blog I got further feedback on this.
I hope I'm wrong.

Hi Doug.
Thanks for the clarification.

There is a misunderstanding. I didn't mean to look for that particular article.
If I find exactly that even better but it is not mandatory.

I'm looking for any winch that has metal gears and a plastic spool.
They are objects for nautical modeling, so the dimensions are roughly always the same, they vary slightly.

I saw that in this forum, although I don't remember exactly who, like me, uses these winches instead of the normal servo controls.

The characteristics may be close but not necessarily exactly the following:

Sail Winch Servo 13kg / 0.7sec (360deg) / 55g
Specifications:
Weight: 55g
Dimensions: 40.5 x 20.2 x 38mm
Speed: 0.9sec / 360deg (4.8V) - 0.7sec / 360deg (6.0V)
Torque: 11kg.cm (4.8V) - 13kg.com (6.0V)
Operating voltage: 4.8 - 6.0V
Gear train: Metal

However, to help me understand better I'll post the link to the one I looked at (but which isn't available) as Doug suggested.

https://hobbyking.com/it_it/sail-winch-servo-13kg-0-7sec-360deg-55g.html

Sorry Alessandro,
But that picture with no manufacturer name or type / model number is pretty useless for identification.🤔
Maybe you can -
a. take a more informative photo, showing Name and type ID,
b. find your old Hobby King bill for the ID,
c. Give us a link to the Hobby King item or catalogue reference.
Then we 'might' have more luck finding one for you.
Cheers, Doug😎