Also known as a Blandford Cartwheel.
Materials: 1 closed ring 25mm; Approximately 2.5m of thread; Blunt ended needle.
There are four stages to making a Dorset Button on a ring. Casting, Slicking, Laying and Rounding.
If you find you are running out of thread simply thread the tail of yarn neatly through the back of the button and leave a long tail. Add new yarn by threading it back the opposite way to the first thread, leaving a long tail, and continue rounding, stitching over the tails as well. The tails can be woven into the back of the button at the end. A rough guide to thread length is 100 x the width of the button.
Hints and tips: When laying the spokes make sure the spoke you are laying is perfectly in the centre of the ring at the front. Don’t worry about the back. This will help to make your spokes central. The holding stitches you put in will pull the back spokes into place.
Casting
Have a length of yarn approximately 2.5m long. Tie the yarn round the ring in a single knot, leaving a tail of about 1-2cm. Stitch round the entire ring in blanket stitch, covering the tail as you go. Bring the needle towards you through the ring and pass it away from you through the loop created. Make sure to cover the whole ring, moving the stitches along the ring so there are no gaps.
The first knot
Casting in blanket stitch
Slicking
Turn all the stitches so that they face inwards, leaving a smooth edge to the button. The thread should drop from the back of the button.
Slicking
Laying stages
Bring the yarn from the back, down and towards you under the ring, then back up. This forms one spoke. Turn the ring and repeat until there are several spokes around the ring. The spacing should be even. For this button 10 spokes looks good (that’s 5 wraps). Each wrap will move to the left at the bottom and the right at the top. The back spokes will not lie centrally at this point. Make two stitches in the centre of the wheel to hold the spokes in place, being careful to catch all the threads from the back and pull them into the middle. The first stitch comes from the back of the button opposite the last spoke laid. I make my second stitch across my first, so they look like a cross. If your spokes are not central and you want them to be, firmly tug the middle until it’s placed centrally, using the side of the needle.
Laying stages 
Centre stitch
Rounding
Back stitch round the spokes. Bring the needle up from the back. Pass it back down clockwise over the spoke. Bring it back up two spokes anti-clockwise (include the stitch you just stitched over). Pass it down one spoke clockwise. Repeat this until you reach the start of you first round. Continue back stitching rounds in this way until the entire button is filled. To make the button more central push the stitches closest to the edge into the middle with your finger, but leave the stitches furthest away.
Rounding
Finishing
Thread the tail of the yarn at the back of the button into the middle and make one or two holding stitches. Leave the yarn tail for sewing onto a garment. 
Finishing off
Completed button