What is it about Glock connectors that cause them to result in different pull weights? Is a heavier connector "firmer"? Or is it the geometry, or a combination? I'm not really understanding whether the spring to the connector is just to make it reset when the trigger bar returns forward, or if also adds resistance to the trigger bar as it moves rearward, affecting trigger pull weight. Thx in advance if anyone has a good explanation of how the connector interacts with the trigger bar.