How to install a dethatching blade on a B&D CM1836?

Hi,

I own a B&D CM1836 (http://ift.tt/2pqfsKc) and would like to use a dethatching blade.

I've bought 3 universal ones and none seem to fit as there's nothing to hold the blade on besides the 1 bolt. The normal blade has the black plastic thing that hugs the blade, but it won't fit on any dethatching blade.

Is there a dethatching blade out there for these mowers?


Thanks!

How to install a dethatching blade on a B&D CM1836?