I found another spare 4009 burner riser, so this time I fitted a 4140 Silent Burner to add to the No.100 Burner options The 4140 is the bigger brother of the 4139/39 No.5 Burner, fitted to No.10 and No.25 Stoves, but not as big as the 4142 whopper fitted to No.6 Stoves. I managed to find a 4678 inner cap (large type with a spigot) after a long search, and fitted a Burmos (Towson & Coxson) No.10 outer cap. This outer cap has 5 rows of holes compared to Primus' 6 rows. Fitted-Up: Burner Body: Inner & Outer Caps: Overhead: First Fire-Up: Kettle On: Anyway, after a ridiculously quick kettle boiling session.... Cheers! Alec