I have been attempting to rebuild a "super smelter", following Tango Tek's design
However, for some reason, it won't work. The items to be smelted are not being distributed along the chain, like they should be.
I think it's because I'm using upside down stair blocks, next to the hoppers feeding the items... like so (forgive the crude drawing - on my mobile)
Basically, the stair block, in the original design, is meant to be a full block, which I believe locks the hoppers.
Is this the case?