Picked up a used HRX217 HMA a few years ago & have enjoyably mowed with it for 3 seasons. Recently I saw an HRX video at ereplacementparts.com where a similar model has the lower spring (called a "tension spring" in the video) pictured below whereas mine does not. Mine has the upper spring only. As you can see, that spring (#8 on the parts list) is part of the orange-lever self-propelling system, and even though mine is not present, I have not had any issues with the mower's forward speeds. A Honda parts diagram calls it a "Spring, Clutch Lever Return" for some reason but it's not related to the blade clutch, a feature present on my HMA model. Anyway, I am wondering if anyone knows specifically what that spring is for, and more curiously, why my mower propels fine without it?