I'm intrigued by the aerodynamics, physics, and efficiency of dust extraction port positioning on the radial saw blade guard.
It appears that all earlier design radial arm saw blade covers positioned the dust extraction port approximately 190 - 260 degrees away from the cut contact point of dust creation. Hence, the dust port is on the operator end of the guard. This appears to be the case with other brands of legacy radial saws (ie, DeWalt), not just Emerson models built for Sears.
Newer radial saw blade covers (including the recall blade cover replacement) have the dust extraction port at the column end of the blade guard... approximately 100 - 135 degrees away from the cut contact point of dust creation.
Is the older design better at taking full advantage of the blade gullets hurtling dust within the upper blade shroud, like a shot putter spinning around to make a longer throw?
Is the newer design made solely to accommodate the mechanisms of the lower guard movement and actuation arms and levers... and not as effective at leveraging the spinning blade's contribution to providing a velocity to dust extraction that doesn't entirely rely on the suction power of a shop vac?
Inquiring minds wish to know!