4. Zippers: These fasteners are available in a wide variety of colors, lengths and types. Several type of speciality zippers are available. Three basic types of zipper are conventional, Button Button Hole Stitching of button and button hole 147 separating and invisible zippers. All zippers consist of either a chain of metal or plastic teeth or a synthetic coil joined to fabric tapes. Chains and coils are made in many weights and sizes, spirals of polyester or nylon. Coil zippers are lighter in weight, and usually more flexible, than chain zippers. Unlike metal, they will not rust, and they are available in more colors. Metal zippers are less affected by heat.
1. Cleaning: Always remove lint deposit, dust and thread bits before oiling any part of the machine. Use a small dry brush or old tooth brush and a soft cloth to remove dust and lint. Use a pointed instrument like a needle to pick out bits of thread and lint that cannot be brushed out. To clean the feed dog, remove the needle plate of the machine and brush off all lint deposits and dirt sticking to the feed mechanism. To clean the shuttle race remove the two screws holding the shuttle race assembly to the machine, take out the shuttle race and wipe its groove free of dirt, fluff and broken bits of thread. Some times loose thread wind around the pivot of the treadle and make the machine hard to run. Remove thread bits which are caught in the wheel and all lint and dust sticking to the treadle parts.