Lead dust can form when lead-based paint is dry scraped, dry sanded, or heated. Dust also forms when painted surfaces bump or rub together. Lead chips and dust can get on surfaces and objects that people touch. Settled lead dust can re-enter the air when people vacuum, sweep, or walk through it.
When you are fastening two pieces of wood with screws, keep the pilot hole through the top piece slightly larger than the diameter of the shank of the screw. This will allow the wood screw to pull the two pieces of material tightly together. If the pilot hole is too small, the top piece can climb the threads of the screw and leave a gap between the two pieces.