I think that's what they're talking about. If that's the case, the column is in four pieces. There's a base with a rounded platform bottom, a second middle piece where the brown matches up with the base, then the third from the top that has another flat piece on top of it like the base did on the bottom, finally the cone shapped top. Once it's built correctly the canister will appear.
Still working on the final droid factory one myself. Can't find that bugger anywhere.