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the Heavy-6 Mark II

A Formidable Endgame for the FC660C

Limited preorder

Perhaps gravitas is a good term for it: an object that, by sheer virtue of its weight, commands respect and attention.

The Heavy-6 is my answer to the inherent density and compact nature of Leopold's beautiful FC660C keyboard. This housing aims, quite simply, to be the ultimate after-market upgrade for that widely esteemed keyboard.

This Mark II version features two small but decisive improvements: new logo badges (fabricated using the same process as on luxury cameras) and my ultra-grippy non-marring V2 bumpons.

Available quantities

Because production is already underway, this offering from among my aftermarket housing collection has a fixed number of pre-order spots in each finish.

Quantities are been based on the Heavy-6 waitlist: 158 clients signed up last month to the list, and we are comfortable producing 105 housings total.

Retro-industrial design

I leaned into a kind of mega-chamfered Brutalism on this design, which I feel suits the highly compact nature of the FC660C.

Side profile of Heavy-6 Heavy-6 logo badge

Design details

Rear cover weight

The Heavy-6 comes with a hefty and dense powder-coated steel rear cover plate. This greatly increases the overall weight of the board and also reduces acoustic reflections and sound transmission.

Motorsport with rear cover plate Aperture with rear cover plate

New logo badge

Each Heavy-6 includes a discreet metal Portcullis maker's mark on the rear of the case, in a complementary color. These are produced for us by a factory that does work for some of the most famous luxury brands in the world. The stamped form (produced with custom hard tooling) give satisfyingly crisp edges, and the color surround is a beautifully uniform matte pigment.

Black for Aperture and Titanium. White for Frosted Polycarbonate and Motorsport. Norbauer Pink for VHS.

rear profile of Heavy-6

Acoustic Dampener

An included merino wool felt acoustic dampener absorbs internal sound reflections.


Dimensions: 355mm long x 132mm wide x 29.1mm tall (22.6mm at front, in case you're making a wrist rest). Typing angle is 3 degrees, the same as on the FC660 itself.


The Heavy-6 is compatible with only the Leopold FC660C (not included) keyboard. It is also Hasu-controller compatible. Various custom community plates, PCBs, and mods also exist, but those are beyond the scope of this listing. 😊

Nota bene

This is a DIY kit for keyboard tinkerers and hobbyists. It is an aftermarket upgrade housing and does not include the keyboard itself or keycaps (even though product images may show it with those for illustrative purposes). While the build isn't difficult, it does require taking apart your OEM keyboard. This may invalidate your keyboard warranty, and by purchasing you agree to take on that project and its results at your own risk. (But, of course, that's also part of the fun.) Of course, I'm always here to answer any questions by email if any arise during your install.

This is a limited pre-order offering.

Once manufacturing is complete, these items are anticipated to ship around summer. All pre-order prices include a 10% deposit, non-refundable in the event of cancellation, which you are free to do at any time. Preordering is the only way to be assured of getting one of our pieces; in-stock extras are rarely available.