This is a standard nickel plated Primus No.5Sor, date code 'W' for 1932, which would originally have been fitted with a basic No.5 silent burner. At some point during the 1940s, however, it was converted to alcohol fueling to offset the unreliability of paraffin supplies in Scandinavia during WW2. The conversion was achieved by changing the original basic silent burner for a specially configured regulated unit: It was possible to convert existing regulated burners to alcohol fuel using a special kit, Primus part no. 4195 (Spritsats Primus), but this kit didn't include the 'för sprit' plate seen oon this burner. It would appear that this plate was only found on burners supplied new,ready converted from the factory. The instructiions sheet that came with the diy conversion kit is however very useful in understanding what the different parts the alcohol conversion involved: Getting this stove back into a useable state was something of an adventure. This was the beginning: Thankfully everything cleaned up fairly well, and seized parts succumbed to soaks in Plusgas. Even an initially very iffy NRV seems to have revived, though fixing it if it does give up will be a nightmare as a look down the pump tube shows the head to be comprehensively rounded. A spare Radius spindle control wheel was easily modified to fit too. But then getting it running was a different matter. At first it was impossible to achieve any sustained burn at all. The problem was soon identified from checking other CCS posts: there should have been a damping insert tube; it was missing (part 4418 in the diagram above). Thankfully that part was still available from Sweden. Even that wasn't the end of the saga, however, getting the right outer cap ended up being a process of trial and error. A standard No.5 outer cap ought to have been an original fitting. But the results still weren't at all right, even after the damper was fitted: I had 2 different No.5 hole patterns, both in 'Primus Metal', the more common version on the right, as shown used above, the other with a lower set of tighter smaller outlet holes: ' Switching to the tighter hole configuration made a spectacular difference: So happy now, well chuffed at having finally got a genuine WW2 alcohol burner running nicely @Rangie
@igh371 - excellent work coupled with perseverance to arrive at wonderful result. Well done. Pharael.
Excellent results, congratulations Will you be so kind as to provide the measurements for part 4418. I'd like to try the conversion.
