1970 Master Cylinder

[Datsundude@aol.com]

Hello folks,

Does anyone know how to remove the front piston from a 1970 roadster M.C. 
There is no stop screw, all I see are 4 little indents in the back of the 
piston. The picture of a M.C. at the Rallye site shows a stop screw on the 
side of the cylinder. What do I have, its a 3/4'' bore M.C.

Thanks for the info

Dean