I HAVE A 179 FITTED IN MY FC, THE REAR MAIN SEAL LEAKS NON STOP , IVE REPLACED THE SOFT SEAL 3 OR 4 TIMES TOP AND BOTTOM. THIS WORKS FINE FOR A WHILE THEN THE LEAK RETURNS, . ANY IDEAS ON HOW TO FIX THIS PROBLEM ONCE AND FOR ALL. CAN A LATER TYPE OIL SEAL BE FITTED WITH MODIFICATION TO THE JURNALS???? IF SO WHAT IS INVOLVED.