The present invention for a two-stroke marine engine, which can be used with both high-sulphur content fuel oils and low-sulphur content fuel oils. Atomicity of the scrub operation is assured by protocols set up in the memory controller, not by using an explicit atomic read-correct-write operation. Weed control in areas planted with the disclosed grasses can be achieved by direct application of glyphosate herbicides. The expansion engine converts the thermal energy output from the burner to mechanical energy output. It is formed by a seal carried by said valve body. To effect this, the holster body containing the lower portion of a pistol, slides downward relative to a slide bar component that holds the breach block of the pistol, allowing a live round of ammunition to be loaded into the pistol’s firing chamber with a single hand action, to make the pistol ready for firing.