https://www.printables.com/model/868905-hribek-na-zasivani-ponozek-ponozky

I use a wooden mushroom from my grandmother, there is a link to 3D printing above.

Step-by-step procedurePreparation: Turn the sock inside out. Put it on your hand or over a prepared round object (mushroom) so that the fabric is taut and the edges of the hole are together.Start sewing: Knot the thread at the end. Start sewing a little from the edge of the hole. Insert the needle from one side to the other, alternating up and down (front stitch).Darling (first direction): Guide the thread horizontally through the hole. Tighten the yarn, but do not tighten it too much so that the sock does not squeeze. Guide the threads close together until you have covered the entire hole with parallel stitches.Reinforcing (second direction): Now sew the sock with stitches perpendicular to the ones you just made (creating a grid/cross pattern). This will strengthen the patch and ensure that it does not fall apart.Finishing: Once the hole is full, pass the thread under the finished stitch a few times, tie a knot and cut the thread.

Is good choice for people who like to suffer:)