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 6006140×6
Technic Beam 2 x 4 L-Shape ThickBlackPart 32140Element 6271825 or 4120017×2
Technic Beam 1 x 3 ThickLight Bluish GrayPart 32523Element 4211655×5
Technic Beams Special
12 pieces
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallBlackPart 64276Element 4560108 or 4537514×10
Technic Beam 1 x 2 with Ball Joint AngledDark Bluish GrayPart 50923Element 4503381 or 4289258×2
Technic Pins
12 pieces
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×7
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsBluePart 6558Element 4514553×3
Technic Bushes
4 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×4
Projectiles / Launchers
3 pieces
Launcher, Large Figure Weapon, Zamor Sphere Launcher, with Hole and Axle HolePearl TitaniumPart 64275Element 4609686×2
Projectile, Large Figure Weapon, Zamor Sphere / Ball with Marbled Bright Light Orange PatternRedPart 54821pat0001Element 4622390 or 4612532×1
Technic Special
2 pieces
Technic Ball Joint with Through Axle HoleBlackPart 53585Element 4286267×2
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.