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“The main advantage of the pull bar drag system is that the drag is being pulled rather than pushed,” explained Bretza, adding “Although the push bar drag system is the most common type used in the industry, this operation places heavy pressure on the left (opposite) side plate and relies on the frame for overall stability, which in our view is a fatal flaw of this design.” As you ramp up the drag lever, the pressure creates frame flex, reducing drag efficiency and causing tolerance alignment issues, a problem Bretza said is further exaggerated on competitive models with open top designs