Big Idea Design Double-Click Pen: How Universal Is It Really?

Introduction

Some pens claim to be universal. The Big Idea Design double-click pen is one of the few where that claim actually gets put to the test. It is built around the idea that you should be able to swap in pretty much any refill on the market, and it backs that up with an adjustable head and an internal collar that shrinks down to fit a wide range of refill sizes.

To see how well that works in practice, we tried five very different refills in the pen: a Cross porous point, a Pilot EnerGel needle tip, a Pilot FriXion erasable refill, a Parker gel refill, and the Schmidt P900 it ships with. The results were surprisingly good, with one clear exception.

What Makes This Pen Different

The pen uses a bolt action with a patented double-click system, but the real story is inside. The head contains a collar that can shrink down to nearly any refill size, and the mechanism adjusts the extension length so you can control how much tip sticks out. That combination is the biggest reason to consider one of these pens.

The two variants tested function the same way when it comes to accepting inserts. The stonewashed titanium finish makes the adjustment easier to see, while the DLC-coated version hides the mechanism a bit more. One detail worth noting: the pen ships with a notably large spring inside the head, larger than what most pens use, which appears to be part of how it accommodates so many refill shapes.

How the Refill Testing Went

The method was simple: grab refills that looked interesting rather than working through the brand’s full compatibility list, which runs to roughly 200 entries. That means some failures were possible, and one did happen.

The first test, the Cross porous point, was the one expected to fail. It is a felt-tip refill, completely different from anything a machined bolt-action pen usually holds, and it is very long. It fit anyway. The felt tip produced a line that darkens with pressure, and the extension adjustment let it retract fully with a click. One caveat: this style of refill benefits from a cap, and a standard cap did fit it, which makes carrying spare felt-tip refills more practical.

The One Failure: Short Refills

The clear pattern from testing is that long refills work and short ones do not. A shorter doctor grip style refill was too short for the pen even after adjustment, sitting too far down inside the barrel to reach the tip position. If your preferred refill is on the compact side, this is the one compatibility risk to check before buying.

Everything else went in cleanly. The pen can extend far enough to hold even the longest refill tested, which was substantially longer than the included Schmidt P900, suggesting it has headroom for even longer cartridges.

The Standout: Fine-Tip Gel Writing

The Pilot EnerGel needle tip in 0.5mm with blue gel ink was a genuine surprise. Fine-tip gels are unusual, and this one wrote with an impressively crisp, precise line. The refill adjusted to whatever tip length was preferred, retracted with the button, and turned out to be one of the best writing experiences of the test.

Erasable Ink for Reusable Notebooks

The Pilot FriXion erasable refill earned its place for a specific reason: it pairs with reusable notebooks that erase with heat, where the standard bundled pens are not always comfortable for long writing sessions. The FriXion worked well in the pen body. The ink runs a bit lighter than the others because it is formulated to be erasable, and marks can be wiped off with a rag. The refill comes with its own cap, and the theory is compelling: keep one pen body and a small container of different colored refills to swap on the go.

The Parker Gel Surprise

The Parker gel refill, which is pressurized so it can write at any angle, went in without trouble and produced what was arguably the finest writing performance of the day. It writes like a gel pen but with a fine tip that does not streak as much. It was close to the top of the list, rivaling even the needle-tip EnerGel.

Buying Advice

If you like switching writing experiences without buying a new pen every time, this is the pen for that. Long refills are the safe bet: the felt tip, the needle-tip gel, the erasable FriXion, the pressurized Parker gel, and the included Schmidt P900 all fit and all wrote well. Compact refills, like the short doctor grip style, are the risk.

The felt-tip option, while fun, raises two practical concerns: the exposed tip makes accidental marks possible when fidgeting with the bolt action, and felt tips may dry out faster than sealed gel cartridges. For daily carry, the fine-tip gel or the Parker gel are the more durable choices.

Conclusion

The universal claim holds up. Five refills of wildly different lengths, ink types, and tip styles all worked in one pen body, with only the shortest cartridge failing. For anyone who wants a single machined pen that can become a felt tip, a fine gel, an erasable marker, or a pressurized all-angle writer just by swapping the insert, the Big Idea Design double-click pen delivers on its promise.