I believe that Belleville spring is placed within a cutout in the cast bearing cap. If your cap has no relief for one, you won't need the spring. The one I have came off a different model, and just happened to fit the 200. I assumed it couldn't hurt. I've been wrong before, so I didn't toss the original cap.
I really don't know what a shim or gasket would be doing between the cap and the headstock. Maybe you can assemble the cap with some sort of marking fluid and try to see what might be hitting the bearing and causing it to tighten up. If you really need a spacer, maybe cutting one from some peel away shim stock might give you the adjustment you need. Just be careful, as those preloaded nose bearings are pricey.
Let us know how it goes fitting that spindle back in.
I really don't know what a shim or gasket would be doing between the cap and the headstock. Maybe you can assemble the cap with some sort of marking fluid and try to see what might be hitting the bearing and causing it to tighten up. If you really need a spacer, maybe cutting one from some peel away shim stock might give you the adjustment you need. Just be careful, as those preloaded nose bearings are pricey.
Let us know how it goes fitting that spindle back in.