I've been a mechanic for most of my life, and I guess I have never dealt with this- until today. What is the preferred method of changing out wheel cylinders? I'm sure it wasn't the way I got it out, and then trying to get the retainer back in. This will tell my age, but I miss the 2 bolts that held in wheel cylinders for at least 30 years. Is there a proper tool out there? Thanks in advance?