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How to use a Double Hook Pick

Discussion in 'Repairing your own Gear' started by rsingler, Mar 28, 2019.

  1. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
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    Good correction @halocline ! You're right, of course. I'll edit my post. Thank you for your careful reading!

    EDIT: text corrected in .pdf file in post #1 as well as the thread itself, and file reloaded.
     
  2. stepfen

    stepfen Barracuda

    # of Dives: 100 - 199
    Location: Greece
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    Another great post!. Congratulations @rsingler
    I have a question though.

    The tip still needs to be pushed through between the (potentially hard/stuck) oring and the land. How do you make sure that in this step the tip won't scratch the land?

    To make things worst, in most "easy" cases, after the oring removal, the land is visible and hence it can be inspected. But for this kind of difficult parts (hose inlets etc) the land is not visible even without the oring and hence such scratches can't even be seen.

    Question is theoretical as my equipment is pretty new, hence I haven't needed to remove this kind of o-rings so far.

    Thanks once more for the great help to the community.
     
  3. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
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    If your oring is dried and hardened, it's going to be discarded anyway. So in that case, start with the handle rotated a little more so the sharp tip is definitely away from the land. Then, when you angle the handle, the sharp point will bury itself in the oring, rather than slip between it and the land.
    Further rotation of the handle will then drive the point through the oring, and it will likely fracture as the shaft of the pick is pushed thru.
    That's not a bad thing, as you can use a plastic pick to pry out the pieces.
    You intuition is correct: when things get difficult, keep the point away from the land, and sacrifice the oring.
     
  4. Pao

    Pao Manta Ray

    # of Dives: 200 - 499
    Location: Manila, Philippines
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    I just skewer the O-ring. Much less chance of scratching the O-ring groove.
     
  5. Johnoly

    Johnoly Solo Diver

    # of Dives: 2,500 - 4,999
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    The PDF is excellent because you can really Zoom into the pictures and see the details in what you wrote.
    I'm Always Learning,,,,,thanks for taking the time to write & post this up !!
     
  6. divad

    divad Solo Diver

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    Fabulous post!......thank you.
     
  7. rsingler

    rsingler Scuba Instructor, Tinkerer in Brass ScubaBoard Sponsor

    # of Dives: 500 - 999
    Location: Napa, California
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    That is the preferred technique for many technicians 90% of the time. I have no argument except for the HP oring inside the bore of a Mk5, Mk10 and many other older pieces of gear. It's why the Mk25 went to a stacked series of backup ring, HP oring and washer: so all the parts could be pushed out, instead of speared with a pick.
    Any scratch in the side of the land for the HP piston shaft oring will mean bubbling from the ambient holes and the reg is toast. You simply cannot fix it. As seen in post #4, the double hook is tailor made for tight spaces.
     
    Pao and couv like this.
  8. Andrew Dawson

    Andrew Dawson Nassau Grouper

    # of Dives: 500 - 999
    Location: Kenmore, WA
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  9. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
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    Another great tutorial, Rob.
     
    Andrew Dawson and rsingler like this.

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