Making New plastic window for gauges.

Discussion in 'Fettling Forum' started by Tive, Mar 26, 2020.

  1. Tive

    Tive Sweden Subscriber

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    Hello,

    i have a couple of Petromax 827 rapids, one came with out the plastic window for the gauge, and one with a plastic window that had become yellowish and bulged inward to the point where it interupts with the travel of the gauge hand.

    So, how to fix ?

    First get some suitable plastic, could be any kind as long as it is clear and transparent.

    Then cut out a round piece with a hobby knife ( use the inner distance part from the gauge as a template)

    Then place the plastic part inside the gauge cap, and hold it over a candle, just close enough to make it soft ( this procedure also clears up the plastic if it was somewhat cloudy from the start).

    Not to close to the candle as this will cause bubbles inside the plastic, but just enough to make tha plastic clear up, and then gently press the inside of the plastic to make it bulge somewhat outwards, i know it can be warm, but we are used to that, right !

    Now the new window is ready for use, and the now slightly bulged plastic piece is almost magnafying and it will not interfere with the gauge hand moving.

    Starting object.jpg material and cut out.jpg Old and new material.jpg New material gauge cluster and candle.jpg New insert besid gauge cluster.jpg Fixed gauge.jpg

    Good luck with your fettling !

    Regards / Fred,
     
  2. ROBBO55

    ROBBO55 Subscriber

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    Looks good Fred, and relatively simple to do :thumbup:
     
  3. WimVe

    WimVe Subscriber

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    If I remember well the plastic to use is the cover of a cd cover.
    I guess most important is that it is fuel resistant.
     
  4. plantpot

    plantpot United Kingdom Subscriber

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    Brilliant tip :thumbup::thumbup::thumbup:
     
  5. MYN

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    Great insructions. I'm sure we have plenty of yellowed or clouded gauge windows here.
    Only thing is, I find that most hard plastics which are transparent/clear are not very resistant to organic solvents, gasoline included.
     
  6. Tive

    Tive Sweden Subscriber

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    Thanks guys, it does not have to be thick or hard plastics infact the original ones i have come by, (Primus 1930s and petromax 1930s ) are using very thin plastics, probably lucite, as they called it. these gauges has no pressure or fuel entering the area where the plastic sits, ( compared to level gauges ) the seal is on the other side of the lid. The yellowed plastic part shown for comparison is the original one from the Petromax, the one form the Primus lantern looked just the same, and they are actually thinner than the plastic i used. on new lanterns like the Santrax, they use something simmilar to CD cover material.
    Fred.
     
  7. george

    george United States Subscriber

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    Great idea! I have a plastic gage on my Px 828 that's clouded up, perhaps this method will work! Soon as the arthritis clears up a bit I will give it a try.
    :lol::thumbup:
     
  8. WimVe

    WimVe Subscriber

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    Here is a picture of the "Bundeswehr" (BW), matt grey version.
    Marked Original Petromax as well as the Geniol type.
    Thickness , measured at the rim is 1mm.
    The half moon piece on top is not massive piece on the flat area but hollow and it curves down towards the rim.

    Manometer_glas_BW web.jpg

    Spoiler: notice the 4.
    The plastic should be fuel resistant because we spoil fuel once in a while....

    Here the Petromax D.R.P. version I have at hand.
    Flat disc about 0,3mm thickness.

    Manometer_DRP web.jpg

    It would great to see more variations.
     
    Last edited: Mar 26, 2020
  9. Tive

    Tive Sweden Subscriber

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    Yes, my DRP version its just the same thin style, but, newer ones just like the other style shown.

    And most plastics are resistant or fuelproof as long as we talk keroseene.
     
  10. Alenstein Poland

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    Because I've got plenty Px 2827 made already 65 plastics for future…

    IMG_20200326_094457.jpg
     
    Last edited by a moderator: Mar 27, 2020
  11. Tive

    Tive Sweden Subscriber

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    :lol:, You are planning to collect many lanterns, and mainly Rapids ! :D/
     
  12. Alenstein Poland

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    I already have got 20 something Petromax 2827, mainly with damaged plastics, now, because is coronavirus and I have to spend lot of time at home, I made them plenty:)
     
  13. AussiePete

    AussiePete Australia Subscriber

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    A very good and informative post @Tive
    Thank you for sharing.
    Cheers
    Pete
     
  14. Darryl Durdin

    Darryl Durdin Australia Subscriber

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    thank you for sharing your tip on replacing the window on gauges, I have a few lanterns with pressure gauge but no windows , they are a bit busted, if I couldn't find a replacement I would follow your lead and make them one way or another,
    great fettling tip and directions and it all makes great reading.
     
  15. Tive

    Tive Sweden Subscriber

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    Thank you guys ! for your nice comments, and good look with your fettling !
     
  16. Rob Mikell

    Rob Mikell United States Subscriber

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    I do the same for flaslte lenses, easy and quick.
     

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