The Workshop Sheet 10 of 22

LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Expert Builder/Gear Parts

Checking

961 Expert Builder/Gear Parts

78 pieces in 22 part and color combinations.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Show

Piece checklist

Light Gray 46 pieces

  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×6
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×10
  • Technic Engine Piston Square 2 x 2 - Old Light Gray Part 3652 Element 365202 ×2
  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×1
  • Technic Gear 24 Tooth [Old Style - Three Axle Holes] Light Gray Part 3648a ×4
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×4
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×15
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×1

Yellow 22 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Yellow Part 3703 Element 370324 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×6
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Yellow Part 3702 Element 370224 ×4
  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×2
  • Technic Plate 2 x 8 [7 Holes] Yellow Part 3738 Element 4624216 or 373824 ×2

Black 10 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 12 Black Part 3708 Element 370826 ×1
  • Technic Axle 2 Black Part 3704 Element 370426 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×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.

Request a replacement from LEGO

Buy the piece

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.