Master Cylinder Push Rod Question

Most Chrysler master cylinders have just one tiny sheet metal finger holding its piston in the bore. Try to pull the master off the rod in the car, the finger bends/fails, the piston pulls out, fluid flows everywhere. I separate the rod at the pedal, pull master cylinder and rod together. Block the piston in while pulling the rod at the workbench to prevent a fluid mess there too. Rubber collar goes in master cylinder first/alone, then rod goes into it.
Most difficult step is going under the dash with tools to get that bolt out at rod to pedal.
Don't forget to disconnect neg' battery cable so brake lamps don't drain battery.