Finding a specific dial for a discontinued German coffee grinder

The ask

The roaster's shop had opened in a converted warehouse in Nørrebro in 2011, and the first piece of equipment through the door had been a 1962 Mahlkönig E80 supreme — a heavy, cast-aluminium commercial grinder from the Hamburg workshop, bought secondhand from a closing hotel in Malmö. It had been in continuous daily service ever since. Ninety kilograms of coffee a week, six days a week, for fourteen years.

The grind-adjustment dial — an anodised aluminium disc with an engraved brass scale and a small internal contact ring — had failed. The engraved surface was worn through in the working range, the brass insert had loosened, and the internal contact that engaged the calibrated micrometre stop had burned out. The grinder still turned, still ground, but the operator could no longer set a repeatable dose.

Mahlkönig had discontinued replacement parts for the pre-EK series in 1998. The current factory in Hamburg was polite but firm: no drawings, no stock, no serviceable substitute.

We could buy a new grinder. But this one is part of the shop. Customers know it. The staff know it. We are not going to retire it over a dial.

The search

The E80 supreme was made in modest numbers between 1958 and 1971, mostly for the German and Scandinavian hospitality trade. Surviving units are uncommon. Surviving units with intact original dials are rarer still — the dial is often the first component to fail because it takes the full torque of the daily adjustment.

We started with the two Mahlkönig specialists we knew: a workshop in Hamburg that services current models and occasionally takes in vintage repairs, and a retired factory technician in Bremen who had been part of the original E80 assembly line in the 1960s. Neither had a dial. Hamburg had a partial parts drawing but no stock. Bremen had memories, useful ones, but nothing on a shelf.

The lead that mattered came from a café supply company in Wuppertal that had ceased trading in 2018. Its remaining inventory had been consolidated into a basement warehouse under a receiver, and the receiver — a man patient enough to answer strange enquiries — confirmed, after two weeks, that the basement contained four Mahlkönig E80 units in unknown condition.

The find

We travelled to Wuppertal in June. The four grinders had been stored on a wooden pallet, wrapped in oiled paper, since roughly 2005. Two were complete. Two had been partially cannibalised for other repairs, but all four retained their original grind-adjustment dials. All four dials were serviceable. Two were nearly unused — the grinders had come from a hotel that closed within a year of opening.

We bought all four grinders. It was cheaper than the alternative of buying only what we needed and negotiating each piece individually, and it left a supply of related parts — hoppers, burr sets, motor shafts — for future work.

The dials were removed in the workshop, cleaned, tested for electrical continuity on the internal contact, and inspected under magnification for wear on the engraved scale. Two were designated for the client, one for immediate use and one as a spare. Two more went onto our own shelf, catalogued and available.

The delivery

The replacement dial was fitted at the roaster's shop on a Sunday morning, when the grinder was cool and the espresso machine could be spared for two hours. Fitting took forty minutes. Calibration against a set of test grinds took another hour. By opening on Monday, the E80 was running at the same setting it had used the previous Friday, indistinguishable in the cup.

The four donor grinders remain in our workshop. Three will likely be sold on as complete units to other operators still running pre-EK Mahlkönigs. The fourth is being kept as a reference machine.

It grinds the same as it did last week. Which is what we wanted. Nothing more.