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Hi Dan Been through a number of brakes on different models and the first thing you need is patience. When you talk of pins in the housing Im assuming its the ones with slots that the brake shoes fit into. These can be tough. I would soak them good a number of times with penetrating oil and then try turning them with a tool in the slots. Also try tapping them with a hammer as the vibration may loosen them up and allow the penetrating oil to work. The cam pin that expands the brake shoes is usually seized but that pin can usually be moved by pounding it out after using penetrating oil. Once out you can clean the pins and polish with emery cloth and also cleanout and polish the bores. Coat the pins and bores with a film of grease or oil , you will be amazed at how easy the brake works and retuns to neutral. When you have gone this far you may as well remove the brake shaft too and polish and grease. I believe the B is the same design as later models so you need to know that the adjuster screw is removed by continuing to turn it clockwise out of the housing. If you try to back it out it will stop against a shoulder and no amount of force will get it out. If the above does not do it you will have resort to heat with out any worries. This is not a watch. Good luck
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