It's a balanced keyboard.
The manual action uses a fan arrangement of backfalls to transfer the action from the keys to the pallets. There is a roller board that sends every other note of the bass octave to the right side of the windchest.

The rollers made in aluminum tubing

Here's what a roller stand looks like assembled

The two roller boards assembled

The wooden pin holes are lined with felt to keep the mechanism quiet

The roller board installed with the wooden pins

Various views

Some backfalls. Each one is different length.

Backfalls installed

The front of each backfall connects to a wire that pulls down the front of the pallet.
The pivot point for the backfalls is stocked with felt to keep the mechanism quiet

The leather glands allow the pull-down wires to move while keeping the pallet box very airtight

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