[KTL]

Just to add to Gordo's already excellent info, the "press fit" of the parts on the shafts is not an extremely tight fit. That means the parts can be carefully tapped into place on alternating sides to seat them.

For example, you can disassemble the shafts by using gravity + the weight of the stack. Take the shaft and strike it on a plate of aluminum or some other "soft" sacrificial material. Doing so self slide-hammers the parts off of the shaft. John Walker here on the forums taught a lot of us DIY'ers this trick.

That said, i'm not crapping on the use of heat to assemble & install things. Works great. Get a good set of clean gloves to make life easier. Leather work gloves or welding gloves work perfect