Why is the slider running very heavy / hard?
Check that there is no special process such as turning out the bag that creates high pressure on the slider pushing the slider against the bottom end of the opening. Check that there is sufficient clearance to allow the slider to run smoothly without rubbing against the fabric / leather of the item or the […]
Why is the slider not closing the chain?
Check that the slider and chain are from the same zip supplier and are the correct sizes to match one another.
Why is the zip is curved / humpy after stitching continuous zip chain to the product?
Spiral / coil zips have an S twist and Z twist in the teeth creating a ‘smile’ or ‘frown’ appearance when the teeth are joined. The left and right teeth should be both in the same direction/condition. If this is not the problem, check the sewing tension is equal on both sides of the zip.