The Signalist SBR is a motorising base to enable simple and quick motorisation of Ratio signal kits. To use you simply drill a 15mm diameter hole in the baseboard, cut down the fixing lugs by the thickness of your baseboard, clip one or two SG92R (or similar) servos in to the base and screw the base to the underside of the baseboard. The assembled working Ratio signal simply drops in to the base and can be easily removed if required. The servos simply bear on the levers that stick out of the bottom of the ratio signal so there is unlikely to be any need to set the servo endpoints. Complete installation and set up of the completed signal and base should just take a few minutes. The only thing you need to do to the Ratio signal is file an alignment notch in to the bottom of the mounting tube.