Loudspeaker for scalextric control tower

When my friend reenacted his passion for scalextric (yes! he still has the boxes !) it happens that one of the louspeakers on the roof was missing.
Took out the vernier caliper ... and here we go!

Was left a little bit too long (30') in acetone vapour (for a shiny finish) thus the sligh bend at the opening side be careful.

Please post your makes
Enjoy