Cast Iron Nozzle for EKO?

I was at Lowe's yesterday buying an angle cutter and diamond blade to trim down my new refractory nozzles (what a pain in the tookus!). Anyway, I mentioned what I was doing to the guy manning the tool department and it turns out he has an EKO 60 as well, and recently replaced the nozzles. According to him, he got cast iron nozzles from Mark at AHONA, and says they work well.

If I hadn't just handed Zenon $200 for nozzles that required extensive modification and expense to make them work, I would have spent the afternoon driving down to Burlington Flats for a set of those cast iron slots. Anybody know anything about that?

Got 'em to fit eventually, but not before basically shaving down all four sides of each one. Trimming down the tops alone didn't work. Boiler works nice, now. I think I got a big gain in efficiency, though it's hard to tell with this relatively warm weather.

They ought to be as durable as run of the mill cast iron grates for a wood or coal stove, I'd think. Those last a good long time. How about a cast iron nozzle body with easily-replaced drop-in ceramic inserts to form the business end of the nozzle? Replace them annually.

Getting back to the cast iron grate similarity--both exist with a bed of hot coals sitting on them, and both experience airflow across the surface--HOWEVER--with a downdraft gasifier, the hot wood gas passes down through the nozzle. In the case of most cast iron grates, cooler combustion air passes up through the grates and into the firebox and they're never exposed to potentially corrosive wood gas. So, that may be an important distinction determining the lifespan of the exposed material.

I'm still pretty enamored with my idea of having a cast iron holder for ceramic inserts that drop in to form the nozzle slot. It would be a relatively small replacement part (the ceramic) and as long as the cast iron didn't warp or otherwise get deformed, replacement should be a lot easier than digging the big ceramic nozzles out and trying to make the replacements fit. I think you'd see a nice efficiency gain over time if they were replaced every year or two.

As to special materials, I seem to recall, back in the day, when nofossil tried a variety of different alternatives to the u-shaped blocks in the secondary combustion chamber, and wound up with a bunch of very expensive, melted material. My blocks, BTW, are still fine after 8 years of service. One has a visible crack, but it's still together. The other two look cherry. I think that's because I never move them.