How do you get the laser in banjo kazooie NB. I won act 5 of Jiggoseum and it said i got but have on my trolley.?

The Laser Upgrade in Banjo-Kazooie: Nuts & Bolts is located in Showdown Town, in a tall tower accessible via the use of a Flying Machine. Upon entering the large main room of the building, you need to activate a switch. This initiates a challenge with Gruntilda inside a massive mechanical robot. Defeating her will reward you with the Laser Upgrade, which can attach to your vehicles.