Impressively heavy magnetic prep/tamping block for use with my Billet Baskets only. Weighs 4lbs with rubber footing to grip onto your counter.
Works with or without a portafilter (only for straight through portafilters without a lip at the bottom)
Video demo here
The base is a solid block of stainless steel which houses a very strong magnet. The magnet is turned on and off by rotating the upper Delrin/POM body which is sized for specific basket diameters.
Additional bodies will be made for other diameter baskets. Base and magnet will be reused so only the body needs to be replaced.
Last photo is a pre-production unit for reference.