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.
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleBlackPart 60483Element 6265091 or 6006140×2
Technic Beam 1 x 9 Bent (6 - 4) ThickBlackPart 6629Element 6279881 or 4119800×2
Technic Beam 3 x 3 T-Shape ThickBlackPart 60484Element 4552347 or 4535771×2
Projectiles / Launchers
3 pieces
Projectile, Large Figure Weapon, Zamor Sphere / BallBright GreenPart 54821×1
Launcher, Large Figure Weapon, Zamor Sphere Launcher, Bottom with Axle HoleFlat SilverPart 98564Element 6021669 or 4649271×2
Bars, Ladders and Fences
2 pieces
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-Bright GreenPart 58176Element 6507869 or 6171864×2
Supports, Girders and Cranes
2 pieces
Support 1 x 1 x 5 1/3 Spiral Staircase AxleBlackPart 40244Element 4155558×2
Technic Gears
2 pieces
Technic Knob WheelBlackPart 32072Element 6284188 or 4248204×2
Tubes and Hoses
2 pieces
Flexible Ribbed Hose 8mm Ends 19L with Lime Green Centre PatternTrans-ClearPart 57539pat0002Element 6059315 or 4583980×2
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
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.
Mark 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.
Keep a record
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.