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Old January 24, 2013, 08:01 PM   #10
Senior Member
Join Date: May 4, 2001
Posts: 7,042
I've seen a setup for this using a metal tube or pin that will fit into the barrel covered with clear aquarium tubing or white Tyvek or Teflon laboratory tubing.
These kinds of plastics won't harm the bore and won't be affected by lubricants, especially the Tyvek or Teflon lab tubing.

Plus the tubing is very cheap.
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