Hi, I don't yet have a Hasag stove but the reserve cap and riser arrangement of this Anchor stove look similar: https://classiccampstoves.com/threads/anchor-no-3-1930s.19493/ Best Regards, Kerophile.
We did some research and got details for the riser. Burner needs around 0,8 mm pitch and I looked it more and seems that 30 tpi thread is perfect for the burner. Looks that it's same thread as in Optimus 00 and Primus 210 burners. Just for testing I decided to make a test thread before I try to make the riser. That thread pitch is not so common and my lathe didn't had a feed for it. I remembered that I bought some gear wheels for the gear box some time ago, but they were not sizes that are in use on my lathe. I checked those gear wheels I noticed that with the I can get 30 tpi feed for the lathe. I did some gear wheel change: Lathe had an English made sturdy "Snail Brand" spanner for gear wheel nuts (is that brand still available in UK?): Thread turning worked and thread screwed into Primus 210 riser nicely: Next I proceed to make the riser itself. Internal thread might be a change to make, but l'll see how it works...
Today I proceeded with the riser itself... I worried how inner thread making to a quite small hole works. It worked ok and burner screwed into the riser without problems: In Hasag's riser there is no thinner part between the burner and nut section as in Swedish stove risers do. I parted off the riser from the hex bar and made tank thread into it: This is a first prototype and we will test it on next week and see how it works to the actual Hasag tank & burner. I'll take some Finnish Vodka with me so if riser won't work perfectly we can comfort ourselves with a few zips of Vodka.
Prototype riser looks perfect! I'm looking forward to the test. Let the tests succeed and celebrate with Finnish vodka.
Last week we tested the riser. @YOSH had kindly reserved a dinner at Sashimi restaurant so first we took same Japanese delicacies with Sake & Vodka : Riser screwed into tank without problems: Burner thread at riser was a bit too tight, but it was possible to test how stove works with new riser:
Hi @Afterburner , Thank you for bringing Hasag's special custom made riser to Japan! I was very glad to eat sashimi with sake & Finnish Vodka together. I had tested that riser at home. It works perfectly! Thanks again, Yosh
@YOSH Good to hear that stove runs fine now! Together with international co-operation we got this old stove running again. Thanks for the all the help for making my visit enjoyable and easy! Without local help it would have been much more difficult to find all the best places&things there. At one shop I got these nice probes for stove gasket & thread cleaning: http://www.hozan.co.jp/E/catalog/Soldering/P807_809.html They could be good tools to have for a stove maintenance kit...