CK.
Click on this link for some really cool video clips and step by steps by Eumer.
http://www.hycreek.com/eumer.wcs?type=BTUBES
To see the video clips, just click on the different metal tubes, then underneath each one you will see a little TV or camera icon. Click the icon and the show starts.
If you want to see the plastic tube versions click on the left hand menu and click on the plastic tubing...it will show you how the graduated ( tapered needle ) works. Basically a jamb technique.
Hope that helps
Paul
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