I settle for single-serve hopper made of the mundane and ubiquitous ABS coupler for 1.5" pipe. A little black electrical tape around the middle accommodates the taper in the throat of the Macap MC4.
Possibly of slightly more interest is the 145-gram plunger/deadweight, with the hollow bottom to accommodate the acorn nut on the burrs. It's made from two PVC fittings, joined by a 1/2" brass nipple (not visible), with a 1/2" brass plug for a handle. Each PVC fitting had a hex end, the corners of which were filed down slightly to make a cozy fit inside the ABS coupler, making two "bearing surfaces". The upper "bearing surface" is just below the top of the ABS hopper with an 18-gram dose, and is just starting to protrude with 20 grams. -Ed
