[Bills928]

I'm in the process of rebuilding the front calipers of my 84. I have them all apart and ready for reassembly with new seal and dust boot, I am reading in the manual where the piston must be rotated to 20 degrees, how does one determine where 20 degrees is ? ... Are there marks that line up the piston with the housing? What is the reason for the 20 degrees ?.

Thanks for the help
Bill