Good morning, Wayne.

 WC> I'm talking about putting the pastic under the print head
 WC> protector and never block the pinhole size opening in the 
 WC> plug I've repeatedly removed and replaced in the 
 WC> process of refilling a cartridge.

  Same here. I kept them all, these small covers and I use them too. Saves
  the day for many a tank. The kit that I obtained, has an eyelet screw
  provided to remove the plug. quite handy.

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