God morning, I bought a Primus 57 a few weeks ago, in rather good shape. The pumpleather was dry, easy to fix. The cleaning needle was gone, no big problem.But when I started reading on ClassicCampStoves I found out there should be a rather special inner cap on the burner, where on my 57 was a common inner cap beneath the correct outer cap. It should be inner cap No 4679. Then I began to create something I thought might work but it did not, there were flames aside trough the four holes from the burner house. You can see a white spot in the next picture, that is one of the four openings in the burner. As you can see I made some sort of tube, widened one end a bit in order to make it look like a No 4679 inner cap. I used a common inner cap and slided the home made tube in it. The problem is it lies to deep into the burner, a No 4679 inner cap seems to have some sort of ring and I suppose that ring is as wide as the outer cap so no gas should leak aside. I suppose it would be to easy to ask where to buy a number 4679 inner cap? But maybe one of you have a suggestion how to solve this. Are there more stoves using the same burner? Regards, Ton.