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I use Watkins & Doncaster (www.watdon.com) D3 micro pins for most tachinids and A1 for the smaller stuff, like Siphona or Actia - though I have considered trying the Czech entosphinx pins. The main 'stage pin' is a 38mm continental pin at about >=0.5mm. The stage pins can be as thick as you like but the thicker the better so that they are easy to hold and don't flex when being pushed into cork etc. :)