Marc asked us to modify his Knucklehead to accept 2 Linkert carbs. I started by determining the positions of the new intakes in my CAD model of a Knucklehead.
Next step was to remove the threaded inserts of the stock intakes.

After that, we needed to make a strong fixture to mount the heads under the Bridgeport milling machine, so we welded together a strong support out of some scrap iron.