Thats a sad sight to see.
I am the one behind the Dyna Storm evo/lighting project on tamiyaclub. When the prototype company was redesigning the slipper shaft on that they wanted to do the same as the 201 and, as I am reading above, the SV - use pin(s) to locate the gear. This was because it was too expensive to machine the shaft like the dyna storm orginal - with the little ribs all around, locating the metal gear insert.
Could be Tamiya has done the same thing here (ie. cost reasons). Pity.
