Got this off ebay a couple of weeks ago. None of you from here must have spotted it, cos I got it for a steal Reading the 00 patent features post (thanks for all the hard research mainly Bryan & Ross) Bun foot, early. Outside pump nrv, pre 1921. No dimple in spirit cup, pre 1914. I could not get the burner, spirit cup and riser to seal, because the threads in the top of the riser were stripped at the top. If I lost the sealing washers it would all tighten. So I used a smear of fireproof sealant I'm not too happy about that, so this is not going to be a user, unless I can find a hundred year old riser tube Neil
Hello Neil, have that riser turned. Should be straightforward and payable. This stove certainly warrants it! Good find, especially with the knowledge there are many (of us) looking for such an early Optimus. Regards, Mike
Hi Neil, Great spot, and well done. I did go to the Optician's last weekend so when I get my new glases you won't have it so easy next time round
Hi Neil Thanks for the pictures of the external NRV access. I haven't got any stoves that old and always wondered how it went together.
This is the photo from the ebay listing, you can only just see the external nrv. I was just lucky Neil
Hi Neil There are manufacturing tolerances on the rising tubes and burners. If the threads have been cut too deep on both parts the threads will initially grip however with the removal of the tarnish they will not then grip even though there appears to be no obvious damage to the threads. If you have another patent 00 try swopping the burners. You may then find that the swopped burners work on the other rising tubes. I threw a perfectly good burner out before I discovered that the problem was in the threads of the rising tube. When I tried a different burner initially I had the same problem however when I tried another it fitted perfectly. It may not work but it is worth a try Regards Bryan
Thanks Bryan, I don't have anothe patent 00, but I always have my eyes open, I'll just have to be patient. It will just for display purposes until I can find another or I can get a riser made. One of my mates is a toolmaker with access to lathes etc. I'll ask a favour I think. Neil
Coming back to this thread in the light of further examples and discussions over the years I am drawn to comment on the burner/riser thread problem mentioned above. I have found this problem with old Optimus stoves and blowlamps to be very common in a way I have not encountered with any other manufacturer. Maybe this says something about the quality of Optimus production at that time compared to Primus? Early Optimus 'Nobel' blowlamps are notorious for pump tubes that simply fall through the threads in the tanks too!
