I have an old Stanley router H39B that needs lower shaft bearing. It is a shielded bearing (not sealed). Brand of bearing is Norma that is on the tool and it has a bearing #9013DD. Bearing supply houses say it is not available anymore. It is 1/2" shaft size and 1-1/4" OD bearing size. Love the old router and hate to lose it, as I've been using it many years. Thanks for any suggestions.