This how to article doesn't mention that all the risers need to be the same height, within 3/8ths of an inch. This may help determine the thickness of the tread material.

Pete:

It's a spam method used to gain links. I'm guessing the author/copycat is from India or Bangladesh. Nope I checked. The post originated from an IP address in Pakistan. I was close. I delete dozens of these each month.

I took the links out and will eventually delete the post.