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The material deformation you are seeing is called ‘plasticity’. It happens when a material under stress is deformed and doesn’t return to its original shape (this would be called elasticity). In many cases (and it is the case with LEGO ABS plastic), this deformation weakens the material (as mentioned by Kramii). To fix this part you have to deform it ...

You will need to decide between 3711 Technic Chain Link and 3873 Technic Chain Tread, or possibly use them together. Each link of chain is about 1 cm long and 0.8 cm wide and you can get them in packs of 108 (Chain Link Set Product Code: 2000645) The Chain Tread are wider, but seem to be available only in smaller packs, such as Set # 9938-1: ...

They are not compatible, the teeth are completely different. Notice that the red old gear has 9 teeth and is the same size1 as a current 24-teeth, as illustrated by below: The axle hole however is compatible, so you could have a construction using both types. 1. Actually, the distance between axles to have two of these red gears mesh is the same as the ...

One of these? I regularly crushed these as a child. You could try inserting something small into the hole and gently easing it open. I've had modest success with a small screwdriver. Unfortunately, the gear will be weakened following a flattening. If it is badly squashed it is very likely break - either as you try to repair it or in use. Your best bet, ...

The first gear wheels, or cog wheels, were designed by Knud Kristiansen around 1964 or 65; the original Danish design patent was filed on March 1, 1965. Under licence by LEGO, Samsonite manufactured and sold these gears in the USA from 1965-1972, and in Canada from 1965-74. The gears had studs on the top and tubes on the bottom. They could be made turnable ...

In this great GBC machine built akiyuki, you can see 2 types of conveyor belts. The first one is made of the small tread links (3873). The second and third ones are made with the large tread links (57518) He provides many videos and pictures through his blog and YouTube channel.

I would tend to recommend some options which you didn't consider yet: using bevel gears, but actually use a combination of two gear on each axle: a 12t one (the thin one, as you say), and behind it, a 20t one (there you can use a fat one, which will probably be better). Another option is to use a worm screw, which will also allow you to change the direction ...

I don't think it's really possible to salvage it, as others said, you'll only weaken it more. Even if you can place it on an axle, there's a good chance it will break under stress. But replacement should be very easy to find, and don't forget you could also contact the LEGO customer service for that. It sounds a bit overkill, but they will usually happily ...

Dropping stones onto your LEGO doesn't sound like a kind way to treat your expensive Technic parts; I imagine that small bits of stone and dirt will fall through a belt of Technic Chain Link or Technic Chain Tread , what with them being a chain rather than a belt. This will then lead to other bits of your contraption becoming polluted with abrasive gunk. ...

Here's what I did: First I tried a screwdriver and awl, but couldn't get it to work. What did work was pinching it with pliers to open the hole, and then sliding in a rod. The piece is intact, but very flexible now. It is very deformed, but becomes uniform when attached to an axle. I'm going to leave it attached for a while to see if it evens it out more. ...