I spoke with the owner.
He said the red one had 2 tack welded splines and they easily broke off.
The yellow they are screwed in place.
I once used a spline dethather and broke a few splines and they cost ~ $ 15
on top of the rental. That is what made me think this could be used for de-thatching.
Plus my parents had this large wheel, pull behind, with long spring splines on it and it rotated clockwise at an angle to rake leaves. A tree fell on it, so I never really got to use it a lot. My first take on it, it produced very small rows of leaves and it took many passes to move the leaves, this was 10 yrs ago.
I have a lot of trees/leaves!!!!!!!!!!!
I have a back pack leaf blower, but it takes many hours to blow the leafs,
especially, if they are wet!
So my thought is to use this implement, on my, 3 pt hitch to drag the majority of my leaves
into piles that I can depose with the Loader 20 and my Echo leaf blower.