MiiCoffee Silicone Adapter for 58mm Dosing Cup

Works as intended. It's made of a flexible rubber material and fits very tight. One benefit to using this is it will eliminate the cup holder rubber sleeves from wearing out or tearing as they typically do with repeated dosing cup removal/replace from each time you grind.

Too flimsy

Very floppy. Only works by being wedged between spout and holder. I wish there were more options available that look better and work better than this or 3d printed stuff that makes it look cheap.