Although you only need 4" of 1/4" wide elastic, it is easiest to not cut the elastic before you sew it in place by using the following method.
- Mark 1" from the end of the elastic and again 4" from the 1" mark.
- Place a small safety pin on the one inch end.
- Use the safety pin to guide the elastic through the casing. Keep the elastic flat, untwisted and smooth.
- Guide the elastic through the casing so the 1" mark is at one end of the casing and the 4" mark is at the other end of the casing.
- Use the "tails" of the elastic to hold it in place while you sew the elastic in place at the ends of the casing.
- Trim the elastic to the ends of the fabric casing.
- Push the "gathered" fabric to the middle area of the casing so the ends of the casing are smooth.