Hi some weeks ago a realized that the thread of a burner that I wanted to use as a replacement was somewhat screwed up. I wanted to repair it but couldn't find the right die. The thread I measured was M 14,5 x0,75 m and a die for such a thread wasn't available. I asked a good and skilled friend and said he will make one. I got it this weekend and tried it out. It worked well and my measurements were correct. The thread of either a Optimus "Cobra" burner and a normal regulated burner as used in an Optimus 535 are of this dimensions. All the best ocki
Remarkable ! Absolutely remarkable. It's taken me many years to come to the realization that there is no such thing as a non-standard thread, thinking that every thread was made for a specific item/purpose. But increments of half a millimetre I would never have believed, at least not in that size. And not including watches & clocks, etc. I would have measured that thread with a vernier or micrometer and figured that it was a 15 m/m O.D. which was worn down to 14.5 m/m. At least the thread gauge would be right. I assume the toolmaker is a German chap - German toolmakers are the most clever I've encountered throughout Australasia. Thanks. Cheers. Paul, in Melbourne.
In Optimus, older colleagues always said that the reason behind the use of odd threads and sometimes odd measures on parts was to make copying or selling generic/low cost country parts and replacement burners more difficult.
Looks like a very nice die, now you need the corresponding tap. This will fit most stoves that used the Primus thread on their burners Primus/Optimus burner 14mm thread pitch?
