From the Knockology archives
This post revisits conversations from our smaller community before we moved to this forum. I’ve brought the discoveries and memorable moments together, with credit to the members who contributed. These discussions reflect what we knew at the time. Please add any newer information, corrections, or photos below!
You would think a group of people surrounded by complicated mechanical pencils could agree on what makes a mechanical pencil complicated enough.
Many moons ago @pearsonified put that confidence to the test:
“Which pencils constitute the Hi Mecha collection?”
He offered a substantial starting list and a set of features. The replies quickly exposed the real question: were we classifying mechanisms, a collecting tradition, or the pencils that felt special to us?
The proposed admission requirements
Pearsonified suggested that a pencil should have at least one of four qualities:
- A double-knock mechanism.
- Automatic lead feed.
- A special advancement mechanism.
- An unusual way of covering or protecting the tip.
His examples ranged across brands. The list included Pilot’s H-series and Automac, Pentel’s Mechanica and Technomatic family, Mitsubishi Hi-Uni models, Tombow’s Variable, Staedtler’s Micromatic, Faber-Castell TK-matic models, and others.
This was a collector proposing a useful group, not quoting an industry standard. Treat the list as the opening position in a conversation, rather than a certificate of membership issued by the Grand Council of Complicated Pencils. 
The criteria worked. That was the problem.
Once there were criteria, people could apply them to pencils that didn’t necessarily have the same aura as the original list.
@nimrodd suggested the Pentel PN305 QX and Rolly’s PC series. Pearsonified added the Technopress and reluctantly allowed that the PC25 might qualify.
@drifand brought in the OHTO Super Pro-mecha:
“Probably heresy but by those criteria we should include the OHTO Super Pro-mecha, warts and all.”
He also asked about the Platinum Z, Archi Y2, Pilot Protex, body-knock designs, Platinum’s HAYAAI, and the Sakura AT-matic.
That’s what made the exchange useful. If the definition is functional, it has to survive the arrival of a pencil the person writing the definition wasn’t thinking about.
A mechanism and a reputation are different things
Pearsonified clarified that the features were evocative of “Hi Mecha.” He thought some pencils with those features weren’t generally treated that way by the collecting market.
This shifts the question. A double knock is a behavior you can examine. A collecting reputation is a pattern of interest and language that can vary among groups and over time.
Both are worth discussing, but they don’t answer exactly the same question. A pencil can satisfy a mechanical criterion while feeling like an awkward fit in a collector’s mental display case. That awkward fit tells us something about the category.
Jimmy’s Orenznero example made the distinction particularly clear. He pointed out that automatic feed would include it, while saying he wouldn’t personally consider it Hi Mecha. Pearsonified thought it qualified and predicted that it, the Automac, and the S30 could be sought after later.
That was his prediction in 2022. Even collectors looking at the same feature weren’t necessarily seeing the same place for it in the cabinet.
The Injecto arrives to cause trouble
Jimmy then proposed the Pentel P154 Injecto.
Pearsonified said he couldn’t personally elevate a cartridge pencil to Hi Mecha status, adding that he disliked cartridge pencils. Then he immediately made an exception for how much he liked the Injecto itself.
Few things describe collecting more accurately than a firm rule followed by a very specific exception.
The Injecto had managed to make the rule and the exception interesting at the same time.
A better way to use the conversation
For research, I’d separate two notes when documenting a pencil:
- What does the mechanism actually do? Describe the operation and the evidence.
- How have collectors described it? Preserve the terminology, who used it, and any disagreement.
That lets us keep the richness of collecting language without making a loose label do the work of a technical specification.
It also leaves room for an especially enjoyable sort of thread: a member brings the unfashionable or overlooked example that meets everyone else’s rules, and the rest of us have to decide whether we really meant them.