Looks nice, but for $40, I'll play with the hand full of springs I've got.

I've got one that looks like the big one but without the slot. I've got some blue ones. I've got some slightly heavier than the blue but smaller than the big one. And then I've got some really light ones. I think I'm going to put the one that is slightly heaver than the blue in the place of my one big one and see what happens.