Mother-of-all (MOA) and Scotch Tension Knob for Flatiron

In spring 2026, the MOA for Flatiron wheels changed. Prior to this change, the Scotch tension knob was black and could be screwed into a brass insert on the MOA's side. When this knob was discontinued, we redesigned the MOA: a white Scotch tension knob now attaches to the bottom of the wood part at the factory.

Scotch tension knobs can no longer be installed by customers. Whether your wheel came with a black knob or a white knob, you will need to replace the entire MOA for your Flatiron.

Follow the instructions given in the assembly manual. You can find all Schacht assembly manuals on this page.