This post contains updated die information from January 2022.
Yesterday I received an 8mm ridged macaroni die [No. 171] from Emiliomiti. I made dough to test the new die. When I tried to insert the new No. 171 die into my torchio, the die didn’t fit into the Model B’s removable bronze die holder. I compared the No. 171 die to another die I own and discovered that the shoulder on the new die measured 4mm compared to the 10mm shoulder on my rigatoni die [No. 98]. Although the No. 171 and 98 share the same back diameter, the No. 171 has a wider face diameter preventing it from dropping into the Model B’s die holder.
What I learned is that the No. 171 die I received fits La Monferrina’s Dolly electric pasta extruder. Emiliomiti will exchange the new die with one that fits the Model B torchio. Although bronze dies made for Bottene's Lillo electric extruder will work in the Torchio Model B, the Dolly dies will not fit in the Torchio Model B.