I have done it in the past and it seems to work using a cut stanley knife blade. It has been some time since I made one but I think I cut the blade using tin snips but I am not sure. I then put an edge on the wrong side of the cut piece of blade to make it easier to push in.
I then cut the slot in the top of the stand and with a thin chisel, I think I used a small thin skew, start the slot for the blade. I then pushed the blade into place using small needle point pliers and secured each side with a small amount of epoxy.
We have one as do my mother and sister and they are several years old and seem to still work.
john