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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.

Sentry

Checking

7711 Sentry

70 pieces in 33 part and color combinations, plus 1 minifigure.

The official piece count includes the 8 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

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.

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Piece checklist

Hinges, Arms and Turntables 10 pieces

  • Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin with Round Hole Black Part 41532 Element 4159335 ×2
  • Hinge Brick 1 x 2 Locking with 2 Fingers Vertical End, 9 Teeth Dark Bluish Gray Part 30365 Element 4210724 ×2
  • Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends Dark Bluish Gray Part 30552 Element 4210694 ×2
  • Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth Dark Bluish Gray Part 44302a Element 4210884 ×2
  • Hinge Brick 1 x 4 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 Teeth Light Bluish Gray Part 30387 Element 4211695 ×2

Plates 9 pieces

  • Plate 1 x 2 Dark Bluish Gray Part 3023 Element 4211063 ×7
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 ×2

Technic Pins 8 pieces

  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×1
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×4
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×1
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2

Bricks Round and Cones 7 pieces

  • Brick Round 2 x 2 x 2 Robot Body, Axle Holder '+' Orientation Black Part 30361c Element 6450264 or 4194008 ×1
  • Brick Round 1 x 1 with Fins, Open Stud Dark Bluish Gray Part 4588 Element 6331222 or 6321195 ×2
  • Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×2
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×2

Technic Connectors 6 pieces

  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×2
  • Technic Pin Connector Plate with One Hole (Single on Bottom) Black Part 32529 Element 4144023 ×2
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×2

Bars, Ladders and Fences 5 pieces

  • Antenna 8H Whip Black Part 2569 Element 6265148 or 6164379 ×1
  • Bar, 4 Top Bars, Palm Tree Top Black Part 2566 Element 4532220 or 4159103 ×2
  • Lever Small Base with Light Bluish Gray Lever Black Part 298c05 Element 4212005 1 spare in the box ×2

Bricks Sloped 4 pieces

  • Brick Sloped 2 x 2 No Studs, with 3 Side Pistons Raised Edges Black Part 30603 Element 4163524 ×2
  • Brick Sloped 45° 2 x 1 Double / Inverted with Hollow Bottom Black Part 3049c Element 4163371 ×2

Bricks Wedged 4 pieces

  • Brick Wedged, Sloped 4 x 4 Pyramid Center Dark Tan Part 47757 Element 4288761 ×4

Plates Round Curved and Dishes 4 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 1 spare in the box ×4

Plates Special 4 pieces

  • Plate Special 2 x 2 with Grills Black Part 41862 Element 6097661 or 4163544 ×2
  • Plate Special 1 x 4 Offset with Bar Holes Dark Bluish Gray Part 4590 Element 6302647 or 6086709 ×1
  • Technic Plate 2 x 4 [3 Holes] Light Bluish Gray Part 3709 Element 4211444 ×1

Technic Axles 3 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×3

Technic Beams 2 pieces

  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×2

Technic Bricks 2 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 ×2

Stickers 1 piece

  • Sticker Sheet for Set 7711-1 [No Color/Any Color] Part 55428 Element 4289606 ×1

Tiles 1 piece

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1

Minifigures 1 figure

  • Iron Drone / Devastator with Red Eyes Minifigure, checked as a whole figure ×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.

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.

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