[Andy A.]

I would strongly recommend that you consider using a window motor for this type of application, if you have one available. It has an integrated gearbox that produces a usable amount of torque, and it's a very durable motor that won't be easily damaged through stalling (it's designed to stall, in fact).

If you use a rs775 motor for this I think you'll have some problems. The bar is either going to rotate extraordinarily fast or motor will be stalled and burn up in about the same amount of time. In either case it will draw a great deal of current without any gearing.