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1/4 inch socket, back nuts (black plastic)

Discussion in 'Electronic Repair' started by N_Cook, Jun 12, 2008.

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  1. N_Cook

    N_Cook Guest

    Assuming no one knows of a UK supplier of packs of just these and not
    sockets plus nuts. I've run out of salvaged ones to replace the missing ones
    from amps, to be repaired for other reasons than just missing nuts, but
    cannot return to owners with missing ones.

    How to make adequate replacements ? any ideas.
    The thread for the plastic ones seem to be 12mm x 1.75 pitch, ie coarser
    thread than the metal ones that I have dozens/hundreds of.
    Find some black plastic of the right sort of thickness. Ignore the flange
    bit. Grind a cutting face on all 6 sides of an appropriate size old hex
    socket set driver to punch the outer hex shape. Punch a circular central
    hole and tap 12mm thread.?
  2. bz

    bz Guest

    Mix a colorant with an epoxy, cover a long threaded rod with a
    lubricant/release agent, cover in black epoxy, mold into proper hex shape,
    After the epoxy hardens, remove the rod from the center and cut into nuts
    of proper thickness.

    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap

  3. No no no no no no. A brand new jack socket with nut costs 50 pence. Work
    it out, please.

  4. Baron

    Baron Guest

    There is at least one manufacturer in the UK for these. I can't
    remember the name for the moment. I used to buy various sizes of nylon
    nuts and threaded rod from them for high voltage assembly's. I
    probably have some that size in stock.

    Try "Moss Plastics"
  5. N_Cook

    N_Cook Guest

    Such a nut goes onto a 12mm steel bolt with just hand pressure but not
    freely running though. Unlike a 12mm steel nut on steel bolt, but as they
    all so easily work loose, a lock-nut type action would be useful.

    In like sig vein
    Why is pulchritudinous such an ugly word ?
  6. Eeyore

    Eeyore Guest

    WTF are you talking about. ?

    You really do 'lose' the plot' sometimes.

    What's a 'back nut' anyway ?

  7. Baron

    Baron Guest

    Baron Inscribed thus:
  8. Eeyore

    Eeyore Guest

    Oh, black plastic nut - not a 'back nut' at all ?

    To fit Cliff or Rean type sockets you mean ? I'd have thought they might
    supply you direct.

  9. Eeyore

    Eeyore Guest

    Do you mean the black nut shown here on the S2 style jack (stereo jack shown).?


  10. Same here. I replace far more sockets than missing nuts, so always have a
    surplus of nuts.

  11. Eeyore

    Eeyore Guest


    very serious comment. Ay ideas how to make a totally REIABLE jack socket ?
    (especially the make-break contacts ?

  12. N_Cook

    N_Cook Guest

    I fail to see the point in replacing poor sockets that will be equally poor
    in a couple of years time.
    Unless plating is flaking , or the flexing part has lost its spring I
    reinforce what is there with my silicone cordage technique. Both horizontal
    and vertical mount types. Owners have, without prompting, commented on what
    an improvement in the contact force, noticeably gripping the stem of the
    plug etc which I've never come across on any "proper" such 1/4 inch sockets.

    It is a consequence of that , that I've run out of nuts.
    Yes, bush nuts, rather than my misnamed back nuts.

    I've realised I have a load of, unuseful for anything, cable entry glands
    that use a very similar size black plastic (genuine) back nut. I will try 2
    more techniques to adapt to fit these 1/4 inch sockets. The first , heating
    and squashing failed
  13. Eeyore

    Eeyore Guest

    It's a bugger innit ?

    Guess what's one item on my 'wish list' if I'm to have a senior position with a
    major Chinese pro-audio Co. ?

  14. N_Cook

    N_Cook Guest

    odd coincidence.
    Roland micro cube came in today for a failing 1/4 inch input socket.
    This is less than 22 months of proper use, from pcb manufacture date, and it
    has mechanically failed internally, just too littlle metal - Jalco make.

    I will replace this pcb mount one with a wired in chassic type.

  15. Of course you can make a reliable jack socket if you are prepared to pay the
    money for one. The days of over engineered gear that will last decades is
    over. What we are dealing with right now, in the 21st century, is gear that
    is incredibly cheap to manufacture and purchase, and will probably no longer
    be wanted after a couple of years' use. That is what the public want. And
    that is a great situation for most of the cash strapped musicians out there
    who want to have a bit of fun on the cheap. They are largely quite happy
    with a 50p jack socket that will last a lifetime given appropriate care, or
    a year or so with abuse, cos it means they can afford to buy the gear in the
    first place. And if they do want to keep it past that first year or two, it
    will cost them a quid for the part and an hours labour, which will hopefully
    include a service, and it will carry on working for another year or two.

  16. Eeyore

    Eeyore Guest

    That wasn't the question.

  17. Eeyore

    Eeyore Guest

    Yes, I may even still have some of those kicking around. Yes, they are Cliff I
    think. Don't know what the material was but it looked sort of 'welded' onto the
    blade and had a matt finish. As long as I do have some I could have it analysed
    and they'll be old enough to know what the reliability is like with zero service
    use in about 30 years.

    Hah, and Re-an also gold-plated their blades for a while too.

    Didn't telephone jacks use rhodium or some such plating ? I dare say WEEE would
    have fits at such ideas.

    Ah, well if I manage to wangle my way into this possibility (mention nothing to
    no-one btw !), I may be the one taking those decisions at least at a senior tech

    Yeah, but it's crap to have to do that innit - know what I mean ?

  18. Eeyore

    Eeyore Guest

    Interesting idea. I have some colleagues with excellent contacts at the very
    top there.

  19. Eeyore

    Eeyore Guest

    You mean 10cent.

    It's not difficult to do 'critical failure analysis' on any part and improve the
    weakest parts at minimal expense.

    It just simply hasn't been done because of the throw-away and/or 'make-do'
    attitude. Maybe a make/break jack better engineered will cost a extra 5 cents
    but if it lasts 10 years instead of 2 or 3, the value for the brand will be

  20. N_Cook

    N_Cook Guest

    Sticking with guitar amps

    If a company
    1/ Used higher quality 1/4 inch jack sockets
    2/ used clinch/soldered pillar supports for off-board dropper Rs
    3/ Went over by hand-soldering heatsinky components on pcb

    Then I would estimate just those minimally extra-cost changes would rid
    perhaps 80- percent of normal use failures in the first 5 years of use, as
    distinct from abnormal abuses, shorted speaker leads, being dropped etc.

    But then all they have to concern themselves is getting the "QC" down tight
    enough/lenient enough, to make sure they don't get returns in the first year
    warranty period.
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