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 Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 278026×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsBluePart 6558Element 4514553×4
Technic Pin without Friction Ridges LengthwiseLight Bluish GrayPart 3673Element 4211807 or 3673194×2
Projectiles / Launchers
3 pieces
Large Figure Weapon, Zamor Sphere LauncherPearl TitaniumPart 54271Element 6078667 or 4626750×1
Projectile, Large Figure Weapon, Zamor Sphere / BallRedPart 54821Element 4545430×1
Projectile, Large Figure Weapon, Zamor Sphere / Ball with Marbled Yellow PatternTrans-OrangePart 54821pat0006Element 6075599×1
Technic Beams
3 pieces
Technic Beam 1 x 3 ThickBlackPart 32523Element 4142822 or 3252326×1
Technic Beam 1 x 9 ThickBlackPart 40490Element 4645732 or 4542788×1
Technic Beam 3 x 3 T-Shape ThickBlackPart 60484Element 4552347 or 4535771×1
Energy Effects
2 pieces
Large Figure Weapon Accessory, Flame / Lightning Bolt with Axle Hole with Marbled Trans-Yellow PatternTrans-RedPart 11302pat0001Element 6016236×2
Technic Beams Special
2 pieces
Technic Beam 1 x 3 with Ball Joint in MiddleDark Bluish GrayPart 98577Element 6001085×2
Technic Steering, Suspension and Engine
1 piece
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×1
Tubes and Hoses
1 piece
Hose, Ribbed 7mm D. 9L / 7.2cmBlackPart 78c09Element 6443871 or 6420612×1
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.