Sachs clutches are put together like most motorcycle clutches. 2 different types of plates stacked on top of each other. Most motorcycles have somewhere around 7 fiber plates and 8 metal plates. Sachs has 3 metal (inner plates) and 2 fiber (outer plates).
the Official manual says .4 to .6mm of axial play.
I shim with washers on the end until you can press on the clutch and notice it moving, but everything spins free when it's not engaged.
The ebay seller spartamoped sometimes has the 2 and 3 speed outer plates. I got a pair and they are thinner than the normal fiber plates. They are also metal with a ring of friction material on them. I haven't run them yet, I'm working on my motor again.