Here's an option for reseeding your lawn. If you have a large lawn or yard area consider renting or having your landscaper use a power rake instead of a rototiller to prepare your soil. A power rake is much wider and larger than a rototiller and able to cover the area more quickly. You will save time and money preparing your lawn for new seed or sod.
When you are working in an area where a washer or nut can drop into a delicate assembly or be difficult to retrieve, use dental floss. Fasten one end of a long piece of floss to the part and the other end to something solid. When the parts are finally installed, the dental floss can either be cut off or, as in the case of a nut, it will come right off because it will be cut by the threading action.