Hey all! This is a dummy servo based on an old Futaba servo I had laying about! I'd designed it to be a bit tight for the purpose of keeping steering from flopping about once installed. This makes things easier for you to display your shelf queen models on stands or for photos. Fitting dummy servos also means you don't need to sell your models with working servos if you don't want to.
You'll need one of those plastic bearings (supplied in every Tamiya kit) per dummy servo. Once assembled you can put it in place of a real servo, attach your servo saver as you would before (there's no splines on the shaft so there's no need to switch out your old servo saver), and you're done.