A keyboard includes a plurality of keys, and a keyframe into which the plurality of keys are assembled. The main oxidizer flow is lean mixed with a main fuel flow in a premix burner, and the mixture is fully oxidized in the combustion chamber. This means that such indicia carrying elements may be reliably clipped onto the standard head of an applicator hammer without there being any danger of the clips breaking off. In example embodiments, the cartridge is provided by a centerfire cartridge, a shotgun cartridge, and a muzzleloading cartridge. The strainer includes an upper set of slots and a lower set of slots and may be secured to the strainer by a fastener or frictionally engaged with the strainer.