Possible Clues:

• Writing, engraving, tools
• Left, in place of litter, one's old pens
• They're used for engraving swine's home on Long Island
• A little rusty, like needles
• Cuneiform markers
• Hi-fi parts
• LP record pickups
• They fill grooves
• What engravers use: pen, with illumination almost completed
• Lusty liaison involves pick-ups