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GDG Packer Testing pressure gauge query

GDG Packer Testing pressure gauge query

GDG Packer Testing pressure gauge query

(OP)
Hi, Off-shore trying to set up Packer Testing gear ... pressure gauges (GDG) have arrived with glycerin leaking out! It's the weekend so GDG is closed for queries!

There's a top-up hole on the top of the gauge (so I can refill if I can source some glycerin) BUT there's a grub-screw at the bottom of the gauge:
  • what's it for?
  • some guys say it should be screwed IN some say left LOOSE ... any suggestions.

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