A couple observations....as some mention, it will be fine for most riders and last a long time. Yes,
@fattyre you know that I am hard on my stuff because I am always powered up and weigh around190lbs. This puts a lot of stress on these three tabs, so as mentioned, for the most part normal riding will not do what you see above. When I destroyed the 1st one and got stranded, I discovered later that the Ichi cog has an "indent" on one side which allows for some slight chainline adjustment by flipping the cog on the carrier. This allowed me to
incorrectly mount the cog so that the tabs were not fully seated as they were trespassing into the snap ring groove, rendering 1/5th the thickness of the three tabs to be trespassing into the groove. This combination allowed the tabs to self-destruct as they were not fully seated in the round tab slots of the driver. Depending on the hub, the drivers are slightly different, the cog thickness is different and the thin spacers are different, so when you put the snap ring on, make sure there is NO PLAY between the sprocket and the carrier and that everything is in the correct spots.
I will say that if you modify a 1/2" pitch hardened sturmey cog, make sure you take your time to ensure the chain "seats" cleanly all the way around the cog before you ride it by grinding down with a Dremel tool the space between the teeth so the chain sits correctly on the cog. Just because the sprocket is thinner, a skippy chain will just adjust normally, sitting left or right depending on chainline, so it really doesn't matter IMO.