Answers.Body: <p>According to the instructions the 8 tooth light gray gear you have now should be a black 12 tooth bevel gear:</p>
  <p><a href="https://i.sstatic.net/eu4VH.png" rel="noreferrer"><img src="https://i.sstatic.net/eu4VH.png" alt="enter image description here" /></a></p>
  <p>I.e. replace this one:</p>
  <p><a href="https://i.sstatic.net/qdpGX.png" rel="noreferrer"><img src="https://i.sstatic.net/qdpGX.png" alt="enter image description here" /></a></p>
  <p>by this one:</p>
  <p><a href="https://i.sstatic.net/A4gQS.png" rel="noreferrer"><img src="https://i.sstatic.net/A4gQS.png" alt="enter image description here" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-04-15T05:31:51.740Z
Answers.Text: Luckily, this is a very easy fix!
Answers.UserDisplayName: Alex
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-04-14T20:48:31.387Z
Answers.LastActivityDate: 2022-04-14T21:27:42.500Z
Answers.LastEditDate: 2022-04-14T21:27:42.500Z
Answers.UserDisplayName: Michael Verschaeve
Body: <p>At the top of the sleeve part of the boom is a gear and that is supposed to turn against a rack of teeth all along the inner slide part of the boom extension, to make the boom longer or shorter.</p>
  <p>However, it just spins but does not grab the rack.  The inner boom piece slides back in under its weight without resistence.  If I push down on the thing that holds the axle, I can get it to work as long as I'm holding it.</p>
  <p>In the photo you can see I slip a piece of paper along the line where they should be meshing.</p>
  <p><a href="https://i.sstatic.net/3ANB9.jpg" rel="noreferrer"><img src="https://i.sstatic.net/3ANB9.jpg" alt="gears" /></a></p>
  <p>How can I tighten up the clearance/tolerance on this part in a normal Lego manner, rather than briging in other materials or modifying the standard shape?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-04-14T16:42:38.827Z
Comments.Text: I had no such issue with that model, so likely something went wrong during the build. I recommend checking the instructions carefully, perhaps rebuild partially.
Comments.UserDisplayName: Michael Verschaeve
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-04-14T21:29:41.233Z
Comments.Text: As I explained in my answer the 8 tooth gear should be replaced a 12 tooth gear, but can you explain why there is an older type 8 tooth gear in your set rather than the newer dual face one ? Non dual face light bluish gray was last in a set in 2007, the 42082 set is a 2016 set
Comments.UserDisplayName: Michael Verschaeve
Tags: <technic><building>
Title: 42082 crane boom doesn't engage
UserDisplayName: JDługosz
ThreadText: # 42082 crane boom doesn't engage
  
  (Asked by: username_0 on 2022-04-14)
  
  At the top of the sleeve part of the boom is a gear and that is supposed to turn against a rack of teeth all along the inner slide part of the boom extension, to make the boom longer or shorter.
  
  However, it just spins but does not grab the rack. The inner boom piece slides back in under its weight without resistence. If I push down on the thing that holds the axle, I can get it to work as long as I'm holding it.
  
  In the photo you can see I slip a piece of paper along the line where they should be meshing.
  
  [![gears](https://i.sstatic.net/3ANB9.jpg)](https://i.sstatic.net/3ANB9.jpg)
  
  How can I tighten up the clearance/tolerance on this part in a normal Lego manner, rather than briging in other materials or modifying the standard shape?
  
  **Tags:** technic, building
  > **Comments:**
  > **username_1**: I had no such issue with that model, so likely something went wrong during the build. I recommend checking the instructions carefully, perhaps rebuild partially.  
  > **username_1**: As I explained in my answer the 8 tooth gear should be replaced a 12 tooth gear, but can you explain why there is an older type 8 tooth gear in your set rather than the newer dual face one ? Non dual face light bluish gray was last in a set in 2007, the 42082 set is a 2016 set  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2022-04-14. Score: 9 | Accepted answer
  
  According to the instructions the 8 tooth light gray gear you have now should be a black 12 tooth bevel gear:
  
  [![enter image description here](https://i.sstatic.net/eu4VH.png)](https://i.sstatic.net/eu4VH.png)
  
  I.e. replace this one:
  
  [![enter image description here](https://i.sstatic.net/qdpGX.png)](https://i.sstatic.net/qdpGX.png)
  
  by this one:
  
  [![enter image description here](https://i.sstatic.net/A4gQS.png)](https://i.sstatic.net/A4gQS.png)
  
  > **Comments:**
  > **username_2**: Luckily, this is a very easy fix!  
  
  ---
  
  