Hello

You need the plastic tubing from the "Processing Storeroom", which is also 1 inch wide, allowing the metal bars to fit snugly inside.

The plastic tubing is on the shelves in the Processing Storeroom - use the knife to cut it.
Then simply click the metal bars to select them, move them over the new piece of green plastic tubing, and click again to get a "plastic tubing rod".
Hope that helps.
