I forgot to put in a line when I talked about cutting off sleeves and reknitting the cuff at the right length.
After you get the stitches at the lower edge of the sleeve back on the needle, DECREASE the number of stitches evenly to the number needed for the cuff. [knit 8, knit 2tog, ... or whatever number you need].
This will add a slight amount of fullness just above the cuff, which is usually a good thing. Makes the sleeve more flattering and more comfortable for most people, especially when worn over a shirt. EZ used to knit ribbings with 10% fewer stitches for these reasons.
If you need to lengthen a sleeve, same system works, cut, pick-up, knit down. Great for children`s sweaters when they get to that stage of arms and legs growing longer but circumference staying the same.
Salt Spring Island