The converter is an open-bottomed rectangle frame with a pocket sized to accept a 50×24mm cavalry base. Push the base in from the top — it clicks into a snug friction fit. The underside opening (48×24mm) is smaller than the pocket, so the base physically cannot fall through — it locks in place. No glue needed, though the magnet slot gives you the option of adding a magnet for extra security in transport.

To remove, push the base out through the underside opening from below — you never need to grip the model, so there's no risk of damaging paintwork on your cavalry. The smaller underside opening is a deliberate retention feature.

Injection-moulded from ABS plastic — same material, same tooling quality as our base range. The textured surface matches the OBS bases so the converter and base look like a single piece. The pocket grips the 50×24mm base securely — a snug fit, not a loose rattle. The underside opening is smaller than the pocket, so the base is mechanically retained and cannot fall through.

The built-in magnet slot on the underside is a feature unique to this converter — drop a small disc magnet in for secure hold on magnetic transport trays. The outer bottom matches 60×30mm exactly, so converted cavalry bases sit correctly in formation and movement trays designed for the 60×30mm footprint.

Designed for 50×24mm rectangle cavalry bases — the standard cavalry footprint used across mass-battle wargaming for decades. Drop in your based cavalry model and the converter presents a 60×30mm rectangle footprint for systems that have moved to larger cavalry basing. No need to strip riders, rebase, or risk damaging mounted models with fragile lances and banners.

The converter works with OBS 50×25mm rectangle bases (which have a 50×24mm bottom footprint) and third-party 50×24mm bases. Designed and tested for the tightest fit with OBS bases.

Part of the Open Basing System (OBS)

One Ecosystem · Every Size · Every Shape

OBS is a modular basing ecosystem designed as a whole — not a random collection of bestsellers. Every size, shape, converter, and tray is planned to work together. Independent and gamer-built.

New products added regularly — the OBS range is always growing.

Push the 50×24mm base into the converter from above. It should click into a snug friction fit — the pocket grips the base walls. If the fit is very tight, press down evenly on the base edges, not on the rider or mount. Once seated, the top surfaces sit flush for a seamless appearance.

Flip the converter over and push the base out through the underside opening from below. You never need to grip the mounted model — protecting paintwork, lances, banners, and any overhanging parts. The underside opening is deliberately smaller than the pocket so the base can't fall through during play.

The built-in magnet slot on the underside accepts a small disc magnet — drop one in and CA gel it in place for secure hold on magnetic transport trays. This is especially useful for cavalry regiments that travel to events. The magnet sits in the converter frame, so it doesn't interfere with the base or the friction fit.

The converter texture matches OBS bases, so a single colour across the rim and bevel gives a seamless look. Paint the converter rim to match your base rim and it disappears visually in ranked formations. A uniform rim colour across converted and non-converted cavalry ties the regiment together on the table.

The friction fit plus the retention lip means the base is secure for gaming without adhesive. If you want permanent, a thin line of superglue around the inner pocket before inserting makes it solid. Most hobbyists leave them friction-fit so they can switch back if base sizing changes again — that flexibility is the whole point of a converter.