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I just googled 100mm black plastic end cap and an Aussie medical supply company called Medisa has a 100mm black cap ( assuming 98mm ID ?? ) for $2.88 and in stock
Medisa.com.au
Does the cap have to be strictly designed / manufactured / supplied from an Optical or Astro company ??
To me an end cap is an end cap provided its black , not rigid plastic and will fit comfortably
Worth a call ??
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