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 How to make it 
Materials : 
- A small split ring/ key ring 
- Elastic cord (shock cord), diameter/size 2,5 mm or 3/32 inch, length: 40 cm . 
  
 
 
1. 
 Make the large loop, length 70 mm ( measured when "straightened"), 
tighten the knot hard as shown below to preserve the loop size. 
 
  
 
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