Suunto compass bellows replacement

Started by MarkTheBike, June 19 2026, 13:44

Previous topic - Next topic

MarkTheBike

Hi all
Like so many of us, my binnacle compass bellows has failed and dumped all the oil into the bilge. I have done what I think many others have tried and made a new one out of a folding cup (+ Johnson's baby oil) and it seems to be holding but I'm not convinced it's an 'industrial' quality fix. Luckily I was able to take the old bellows out of the base cup and, although quite crumbly, have managed to glue it into a decent semblance of its original shape. Obviously it can't be used in this condition but has anyone tried using one to make a mold and creating a new one out of soft silicone. I've not done any silicone molding before but it looks possible. I think a Hardness value of 25A - 30A should be 'floppy' enough but would really appreciate any advice on manufacturers, techniques, etc. ...or, of course, that these soft silicones aren't suitable for immersion in oil!
Cheers
Mark
ATB

Mark

geoff

My silicon cup repair has now lasted about 15 years .top quality chinese silicon  Geoff

Yngmar

Ours is apparently still there too. Don't see why not, the €1 silicone cup material was tougher and thicker than the Suunto original plastic membrane.
formerly Songbird - Bavaria 40 Ocean (2001) -- now gone farming

MarkTheBike

Hi guys
Thanks for the replies; yep, I appreciate a lot of these fixes have stood up well but mine is still weeping oil very very very slightly from under the hoseclip and I don't want to tighten it any further as I'm sure I'm near the limit of what the plastic can take before it collapses. Perhaps the cup I chose wasn't as good as the ones others have used. Plus, of course, a replacement bellows would allow the bottom cover to be reattached. Well, it was worth asking - I'll just have to experiment. I'll write it up if I'm successful.
ATB

Mark