Old 07-22-18, 12:43 PM
  #4  
fietsbob 
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there are pins which use a ball in them as a safety catch

larger ones can be operated by pushing a button,
that releases the force pushing the ball out, allowing the pin be removed

Quickie wheel chair hubs use that same principle https://www.quickie-wheelchairs.com/

so you will be, literally, re inventing the wheel..


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