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Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (1031) and each piece's element ID, both listed above.
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Activity Booklet 1 - Parts Tray Organizer Card - Set 1030
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Activity Booklet 10 - Wheels - Set 1030
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Activity Booklet 11 - Conveyors - Set 1030
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Activity Booklet 12 - Advanced Gearing - Set 1030
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Activity Booklet 13 - Pistons - Set 1030
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Activity Booklet 14 - Merry-go-round - Set 1030
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Activity Booklet 15 - Cranes - Set 1030
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Activity Booklet 16 - Lifting with Pulleys - Set 1030
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Activity Booklet 17 - Water Wheels - Set 1030
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Activity Booklet 18 - Windmills - Set 1030
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Activity Booklet 19 - Simple Steering - Set 1030
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Activity Booklet 2 - Levers - Set 1030
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Activity Booklet 20 - Advanced Steering - Set 1030
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Activity Booklet 3 - Supports - Set 1030
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Activity Booklet 4 - Lifting & Supporting - Set 1030
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Activity Booklet 5 - Pulleys & Belts - Set 1030
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Activity Booklet 6 - Gears - Set 1030
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Activity Booklet 7 - More Gears - Set 1030
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Activity Booklet 8 - Angles - Set 1030
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Activity Booklet 9 - Flywheels - Set 1030
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Tick each piece as you find it, or mark it missing.
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.
Request a replacement from LEGOMark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.
