I can't stop a leak I have around the cluster gear shaft at the rear of the transmission. I have an early transmission with the thicker retainer plate. The descriptions for the transmission seal kits state they will only work with the thinner 1/8" plates. I've tried sealing with the blue silcone "gasket makers" but eventually it leaks again. Does anyone know whether the available seals can be re-machined to make them fit? I'm tempted to re-seal around the shaft with JB Weld. Any advice is much appreciated.