I need two side handles for an older Black& Decker 1/2" H.D. Reversible, No.1335- Type A , 120 volts, Ser. No. 1300120. This drill has 5.2 amps, 450 RPM's . I have tried Dewalt side handles and the threads were too large in diameter. Also with Porter Cable, the threads/screws starts into the openings, but come to a stop, being to large also. Perhaps smaller threaded handles from another make or model will be compatible, but I know not one. Thanks