Veritas - Generator’s Pricker Replacement

Discussion in 'Fettling Forum' started by AussiePete, Jan 6, 2020.

  1. AussiePete

    AussiePete Australia Subscriber

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    Those of us who fettle or have fettled Veritas lanterns are often faced with the pricker wire damaged or missing.
    To my knowledge there are no “off the self” replacements. Usually, any replacements require modifications to similar prickers from different makes of lantern to fashion a workable replacement.

    The other alternative is to fabricate a new pricker replacement from scratch.

    The following is the story of my fabrication of a new pricker replacement for a Veritas 350 lantern.

    First of all, the crime scene .....

    BB79B546-BD22-4B71-BD4F-27C42B823363.jpeg
    The above photo shows the tip of the pricker wire is missing, an all too familiar discovery while fettling these beasties.

    The broken pricker can be unscrewed from the lanterns pricker rod, as seen in the next picture.

    DDBC8BB6-22B0-46F8-BD94-23DC5E81A41F.jpeg

    The thread of the pricker head is a metric M2.0.

    I sourced 1/8” brass tube from a hobby materials supplier. The benefit of the 1/8” brass tube is that it’ll take a 2.0 mm thread, and because it’s a tube, I can insert the new pricker wire inside.

    DC85B65B-A9D1-4D60-A5C1-035D0D479801.jpeg

    The brass tube took the thread very well as seen below. Whilst being threaded, the 1/8” brass tube was held in my miniature vice, using copper keepers on the jaws.

    A42DA412-575A-43DA-80D0-CED45A4EA4CA.jpeg

    The new threaded tube shown along side the original broken pricker.

    6269AEE1-2CC7-42EC-979D-60E4B8723783.jpeg

    A .0006” stainless steel wire was then selected and a knot tied into its middle. This knot will be crimped within the pricker tube thus preventing it from being pulled out.

    4CB40052-027D-4377-BFAC-BE239E4AAFA7.jpeg

    The new pricker unit was then cut from the brass tube stock. The knotted pricker wire is shown ready for assembly to be crimped within the new pricker’s brass tube using the vice.

    428AA680-697C-4574-B648-1A6469DB7370.jpeg

    The final pricker with the wire crimped in using the jaws of my miniature vice. The brass tube’s end was then shaped to fit nicely into the rear of the jet to prevent any chance of catching.

    75450CFC-F841-4FB1-86FB-95BEBE039892.jpeg

    The proof of the pudding. The generator and valve body were assembled to test the new pricker’s operation using the Veritas pricker control lever.

    I’m please to say, it’s a worker. The following picture shows the pricker wire appearing through the generator’s jet.

    702456FA-B42E-4C78-93F8-16B1339FF476.jpeg

    You have to look closely, but the pricker wire is there doing it’s job.

    Thank you for looking

    Cheers
    Pete
     
  2. ColinG

    ColinG United Kingdom Subscriber

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    Excellent and informative post. I have 2x Superbs and I'm sure the time will come when one or both of them will need replacement pricker wire tips. Having read this post I've already decided to buy some brass tube stock and and wire to make a few test tips ahead of time.

    Thanks
     
  3. ColinG

    ColinG United Kingdom Subscriber

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    Can I ask where you purchased the 0.0006" wire from?
     
  4. JonD

    JonD Subscriber

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    There's an extra zero in there Colin. It will be 0.006" I reckon or 0.15mm.
     
  5. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Well fettled!:thumbup::clap::clap::thumbup:
     
  6. BigStevie

    BigStevie United Kingdom Subscriber

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    Always a pleasure to see your work Pete...
     
  7. Emiel

    Emiel Netherlands Subscriber

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    That's impressive. Well done.
     
  8. AussiePete

    AussiePete Australia Subscriber

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    ERROR
    Hey guys there is an error in the wire size.
    The wire used is 0.006”(0.15mm) not as I originally stated .0006”.
    I put the decimal point in the wrong place.
    Thanks @JonD for the catch.
    Cheers
    Pete
     
  9. ROBBO55

    ROBBO55 Subscriber

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    Nice work Pete. :clap::clap::clap:
     
  10. Alex Smith

    Alex Smith United Kingdom Subscriber

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    As ever a engineering master class. Thanks for sharing Pete.
     
  11. Norman

    Norman United States Subscriber

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    Well done Pete.

    Thank you for sharing.

    Cheers,
    Norman
     
  12. JonD

    JonD Subscriber

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    No problem @AussiePete I am admiring your set of taps and dies for the small sizes!

    We still wonder where you found the wire? I have been looking at music strings for guitar etc and 0.006" is rare as hen's teeth. Custom shops will make them for you but generally they are not on sale in string sets or as single strings as far as I can tell.

    You can bulk buy 0.006" music wire but they are selling long lengths which means high prices.

    I found soft stainless steel wire, 304 grade. wires.co.uk stock # SS0150-050
    Price of that is not too bad. The 50gm reel about 320m long will last a life time of making prickers.
    It's about £7 here inc tax but not shipping.
     
    Last edited: Jan 7, 2020
  13. ColinG

    ColinG United Kingdom Subscriber

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    I found some 0.15mm (that's metric equivalent of 0.006") stainless wire on Amazon for £3.70 for 20M. Should last me years!thereaare w different grades: 304 and 316... 316 is the best grade.
     
  14. Mackburner

    Mackburner United Kingdom Founder Member Subscriber

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    Hmmm! You say the thread is M2. That is the same thread as a Petromax needle. Seems to me it would be easier to modify one of those rather than make a complete new assembly. Brilliant work though it is. We have done that successfully for some Nulite and AGM prickers and they work fine. ::Neil::
     
  15. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Hello Pete, a similar method was used by a fellow in Western Australia/Perth, to make prickers for the Australian Aladdin lanterns.
     
  16. AussiePete

    AussiePete Australia Subscriber

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    @ColinG
    That’s similar to the stuff I bought. It works well and as you said it’ll last a lifetime, many more lifetimes I suspect.
    Cheers mate
    Pete
     
  17. Darryl Durdin

    Darryl Durdin Australia Subscriber

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    Excellent display of being resourseful, i have tried making prickers for various fettles with some succes, but the best bart of your story for me is the knot in the wire, ive been finding it hard to crip and keep the wire from being pulled out,
    Great tip. I used an OHO #3 cleaning needle (tawian), i had to carefully file it round and to shape to fit my 350 veritas.:thumbup:
     

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