I am finishing off a Mick Reeves Super Reaper and have decided that it could probably do with brakes. The main undercarriage is a one-piece metal unit that is bolted to the bottom of the fuselage (see pic).

I do not want to spend a fortune on the brakes but am not sure how to get some that work. How do I stop the brake hubs rotating? There is no strut to stop it.

Can anyone suggest suitable brake units for this application?

Thanks