On opening vintage 80's radios, keyboards without breaking the plastic screw bearings

At your risk. Screw may well be rusty. If high torque is applied on screwdriver the plastic nest will break. But not if the screwdriver tip is heated up at the right temperature so that the plastic becomes soft and no high screwdriver torque is needed. (insprired by a technique Albert is using if needed on some piano screws). This technique successfully used on completely dismantling the SONY Sports CFS-950 yellow, 606152.