This video will take you through the steps to shorten sleeves knit cardigan, however it is speed up.  A more in-depth video is in my online tutorial Magic Circle.

The most important aspect of this alteration is using a stretch elastic or similar product.  Generally when knits of any type are cut and sewn they can stretch.  By using a stretch elastic to shorten sleeves knit cardigan it will stop the stretching of the knit.

Have fun with this one,

Happy altering
Judith Turner