For LIGHT WEIGHT Sewing like as follows:-- Sheer cottons, Silk,Synthetics, Georgette Fine Silk,Fine Cotton,Fine Synthetic,Fine Cotton Covered Polyester. You can use needle size :--9 or 11. ---------- For MEDIUM WEIGHT Sewing as follows:-- Medium Weight Cottons, Synthetics, Poplin, Velvet, Light Weight Woollens 50 silk,50 to 80 Cotton,50 to 60 Synthetic, Cotton Covered Polyester You can use Needle size:-- 11 or 14 For HEAVY WEIGHT Sewing as follows:-- 50 Silk,40 to 50 Cotton,40 to 50 Synthetic,Cotton Covered Polyester Heavy Weight Cottons, Denim Tweed, Gabardine, Drapery You can use Needle Size:-- 14 or 16. ---------------- *Use the same thread for needle and bobbin. Note: *In general, fine threads and needles are used for sewing thin fabrics, and thicker threads and needles are used for sewing heavy fabrics, Always test thread and needle size on a small piece of fabric which will be used for actual sewing. *When sewing stretch, very fine fabrics and synthetics, use a Stretch-needle. The STRETCH needle effectively prevents skipped stitches. *When sewing very fine fabrics, sew over a piece of paper to prevent yarn distortion. --------- Procedure to change the Needle is as follows:--- CHANGING THE NEEDLE 1. Turn the balance wheel towards you until the needle is in its highest position. 2. Loosen the needle clamp screw by turning its top edge towards you. Remove the needle from the clamp. 3. Place the new needle into the needle clamp with it s flat side facing away from you. Push the needle up into needle clamp as far as possible. 4. Tighten the needle clamp screw firmly. --------- TO SELECT A SUITABLE NEEDLE:-- A number indicating the size of needle is marked on the stem. The higher the number, the thicker the needle.
A Stretch needle is recommended for stretch fabrics. Do not use any needle which is bent or blunted. ------------ If in case you require the user manual for your sewing machine EP 377.Just click on the above mentioned link