MGA/MGB gearbox rear seal leak, spline sealing

Just a short video to help resolve one of the issues with sealing the rear of the MGA/MGB Gearbox. Sometimes it can be the rear seal itself or caused by a grooved yoke assemble, but if they are both in good condition and you still have a leak the reason can be that the oil is traveling down the splines in the center of the yoke and escaping past the nut and spring washer. This just shows you the way to fix it insitu.