Correct ! Because of the design, it's easy to distort the base plate which tears the soldered seam between base plate and sidewall. From a post earlier this year In the early days the rule of thumb was if it's not getting any brighter, stop pumping. Later, about the time the X246B came into being, Tilley recommended with a full tank (1.5 pints) give a maximum of 100 pump strokes. (Or words to that effect). This is important especially with the X246B as the base of the tank can easily be distorted by over pressuring.