We sell portafilters and filter baskets. Occasionally, we appear to sell optimism.

The listing explains which espresso machines a part fits. The photographs show the item and its dimensions. Sometimes, we even explain which machines it definitely does not fit.

And still, every so often, someone orders it for something else entirely.

When it doesn’t fit, the reaction can be less “perhaps we should have checked” and more:

“Infamy, infamy, they’ve all got it in for me!”

We haven’t. We promise. We would very much like you to have a portafilter that fits. It makes your morning easier and our inbox considerably quieter.

Different cars. Different parts. Same principle.

We wouldn’t buy a part advertised for a Mini and assume it must fit a Morris Minor because both cars have wheels.

Yet espresso machine parts sometimes seem to be purchased on precisely that basis.

It’s round. It’s shiny. It has a black handle. How different can it be?

Different enough.

A portafilter has to engage correctly with the machine’s group head. The position, thickness and shape of its connecting wings matter, as do the dimensions of the head. Baskets have their own fit requirements, including their rim, depth and how they sit inside the portafilter.

Looking similar is a promising start for a family resemblance. It isn’t a compatibility guarantee.

The basket that was supposed to know better

Years ago, a customer in Germany bought one of our filter baskets for an Aicok espresso machine.

We no longer remember precisely which machine the basket was advertised for. We do remember that it wasn’t Aicok.

The listing specified the intended compatibility, and dimensions were available in the image gallery. Nothing in it said the basket would fit his machine.

He bought it anyway.

It didn’t fit.

What followed was a demand for us to pay the return postage, a complaint to Amazon and negative feedback.

Somewhere along the way, “we haven’t said this fits your machine” had apparently become “we are responsible when it doesn’t”.

We’re happy to stand behind the compatibility information we provide. Standing behind compatibility someone has imagined for us is rather more difficult.

When “no” apparently means “worth a go”

Another customer, overseas, did exactly what we encourage people to do: she contacted us before ordering.

An excellent start.

She wanted a portafilter for an Isomac machine. Now, a manufacturer’s name alone doesn’t necessarily settle compatibility. Different models within a brand can need different parts.

We explicitly told her that the portafilter would not fit her particular model and advised her not to buy it.

She replied, so we knew our answer had reached her.

Then she bought it.

Predictably, it didn’t fit. Less predictably, this still became our fault, complete with an eBay complaint, negative feedback and a request for us to cover the return shipping.

We’re not entirely sure how to improve on “this does not fit your machine; please do not buy it”.

Larger lettering? A small brass band? Someone standing beside the checkout with a flag?

Ten portafilters. One unresolved problem.

Then there was the British customer who told us he had tried around ten different portafilters in his search for one that fitted his machine.

Only one came from us. The others had come from other sellers.

Ours, he explained, was the closest fit.

The closest.

We sell espresso machine parts, so this is an important distinction: “nearly fits” and “fits” are different outcomes. There is no runner-up prize for a portafilter that almost locks into place.

His machine wasn’t one we listed as compatible. He had simply been buying different portafilters in the hope that one would eventually work.

By that point, the experiment had involved repeated orders, deliveries and returns, with all the packaging, postage and handling that go with them.

We couldn’t help thinking that a conversation about the actual machine might have been a more productive starting point than portafilter number eleven.

“Because I could just return it”

Perhaps the most revealing conversation came when we phoned another customer who had ordered an incompatible portafilter.

We weren’t looking for an argument. We wanted to understand.

Why buy it when the listing said it didn’t fit?

His answer was wonderfully direct:

“Because I could just return it.”

And there it was.

The listing could be read later. Compatibility could be established experimentally. If the experiment failed, the return button was available.

We understand the temptation. Everyone is busy, and online shopping makes buying something almost effortless. It’s easy to become time-poor, cash-rich and click-happy.

But “I can just return it” describes the convenience at one end of the transaction.

At our end, someone has to answer the messages, process the return, unpack the item, inspect it and establish whether it can be sold again. Postage has been used. Packaging has been used. Time has been used.

Sometimes, a returned portafilter has also been scratched or marked while someone tried to force it into a group head it was never designed to fit.

The click was quick. The consequences take rather longer.

Help us get it right first time

We all make mistakes. Listings can be misread, model names can be confusing, and an honest misunderstanding is entirely understandable.

What we find harder to understand is ignoring an explicit warning and then becoming righteously indignant when the warning turns out to be accurate.

So here’s our request.

Buy a portafilter or basket that explicitly lists compatibility with your machine’s make and model. If you’re unsure, contact us before ordering.

Tell us the exact model. A photograph of the machine’s identification plate can help if you’re uncertain. We’ll tell you whether we can confirm compatibility, including when we can’t.

Please don’t treat an unlisted machine as an implied “yes”. And if we specifically tell you a part won’t fit, please believe us.

We want you making coffee, rather than making your tenth trip to the parcel shop.

Different machines. Different parts.

No conspiracy. Just compatibility.