video: https://youtu.be/A727MRzyip0
Forge version - 1.16.5 - 36.2.0
Create version - mc1.16.5_v0.3.2d
First way

1. Take a
   Wand of symmetry
   Mechanical belt
   Shafts(2 necessary or more)
   Wrench(just for convenience)
2. Place mirror with wand of symmetry.
3. in front off mirror (left or right side) place shaft.
4. on opposite side of mirror also place shaft.
5. use mechanical belt on these shafts.
6. Just break it by hand or something.
   Result: You breaks two shafts and duplicate belt. but lost shafts.
   Second way

1 Take a
Wand of symmetry
Mechanical belts(2 necessary)
Shafts(2 necessary)
Wrench(just for convenience)
2 in front off mirror (left or right side) place two shafts to make in future conveyor.
3 Place mirror with wand of symmetry in front off two shafts .
4 take a mechanical belts and use it on shafts to make conveyor.
Result: Conveyor has been created on other side of mirror and duplicating shaft.

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This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.