1. HI, i also have a Suunto compas on a bavaria 37 that has lost its fluid.. Am about to dismatle it to try and replace the bello that i suspect is dammaged. i am intrested in one of your replacement bellows to repair the compass as spares are not avaliable as you alreqady know. Please let me know if you are able to post a replacement to me on the Isle of man where we are based. I look forward to hearing from you and my compliments on a great write up to this problem.

  2. Hello together!
    My suunto compass just lost almost all oil (bought the boot recently Bav 31 1999) i do not see any cracks on the below part and also no signs of oil where glas is connected with black plastic. Only place where stil oils is coming out is the lowest part , where is a hole. I ‘ve tried to check what is inside ,looks a rubber gasket or membrane. If I stick this hole with oil resistant glue (or clean it properly the surface) I think can refill the compass with baby oil..😉 Do you think it will be a solution or even if I do not see cracks or damag on the plastic this make no sence? Thx Mate-Hungary

    1. Inside the plastic cover there is a membrane, and these fail from old age. That’s why I designed and printed a new one. I do not think plugging the hole at the bottom will work, as a flexible membrane is needed to let the oil expand and contract due to temperature. I guess it will start to leak again after a few temperature cycles.

      1. Aah no I got it. And Your poliurethane materiel is flexible enough instead the original hard plastic + membrane inside

  3. Hello, I already dismanteled the compass so I only need the cup with clamp and the new LED. Wat would be the price for the set (without the vise for dismanteling) including postage to the Netherlands ??
    My tip : after filling the compass put it in the freezer for some hours , the liquid will crimp. Take it out of the freezer and fill-up the compass again. Repeat if nessessary. This will during normal temperatures cause an overpressure inside the compass wich is absorbed by the flexible cup. It prevents that during temperature variations the inside pressure becomes lower than outside resulting in air being sucked in the compass causing air bubbles. This is the exact reason why every compass has a membrane to keep the pressure inside on a steady level ( just like Your central heathing).

    Best Regards Bas ( Dehler 35 Cruising )

    1. If you place an order for the kit I’ll remove the vice-tools and throw in the LED for free.

      1. Hi,

        I just placed the order , hope I can save the compass with it , I will keep You updated….Bas

  4. Have you double checked the fluid type before giving advice? Many compasses use Isopar L which is a low viscosity hydrotreated heavy naphtha. Sounds fancy but not too hard to find in marine and aeronautical supply.

    1. I couldn’t source Isopal L locally, so I went with baby oil (mineral oil) that had been suggested at other forums. It has worked perfectly for my two compasses. Other brands/models might differ and everyone should check before they pour liquid into theirs. I’ve only tested my 3D-printed parts with baby oil, not with Isopar. According to the material datasheet (https://fiberlogy.com/wp-content/uploads/2018/03/TDS-FiberFlex-30D.pdf) it’s resitance to naphtalene is “fair”. So I cannot be sure that it’ll work as well as with baby-oil.

  5. Thank you for this web site
    How is the baby oils reaction in wintertime.
    Will it freeze ?
    Best regards / Oskar

  6. Hi Njal,

    recently, I bought your fantanstic repair kit, and it worked really fine. Thanks a lot for this solution for a really nasty problem.

    As I said: Everything went fine, but now, after having the repaired item resting on my desk for several days, I detected a tiny, but clearfly visible oil leakage THROUGH THE BOTTOM of the yellow plastic part. There is neither a mechanical damage to be seen (even not with a magnifying glass), nor can it be from hidden oil spill somewhere on the compass – I washed it thoroughly several times, but the leakage is still there. And I can provoke the spill when putting some soft pressure on the mebrane: then you can see where the oil comes through, but – as I said – there is NO visible damage or such.

    BTW: I used just common, but high-class baby oil.

    I could imagine, that there was a small printing error, which caused a tiny, not visible micro-hole in the material? Or do you have another explanation? What would you suggest to repair this?

    Very best regards from

    Ralf Remensperger

  7. Hi Njal,

    just to make the story complete:

    It really looks like that the leakage came from a micro-size printing error in the first bellow, which was not visible at all. But after all, a hole of 0.01 mm is not detectable by eye, but is enough to let the damned baby oil seeping through …

    Anyway: You sent me another bellow for free, which solved the problem. Now my compass is tight, no leakage anymore, everything is ok. Thanks again for your reactivity and support!

    Cheers from Ralf

  8. Hello Ralph, I have two suunto compass, with bellow broken.
    I need two suunto compass bellow replacement kid.

    Can you help me ?

    I am from Andorra

  9. Hello,

    I suffered from exactly the same problem as described above by Ralf. I even tried to seal it with some oil resistant sealant but it did not hold up.

    Kind regards

  10. my suunto compass is of wall mounted type, but the dimensions of the broken diafragm bellows are similar. My cup is somewhat deeper, but your design would fit anyway.
    I would only need the PU cup.
    Can you still print one for me?