Hey F, the fix seems so simple to me I wouldn't bother purchasing a new clutch!
Apparently I'm unable to communicate well enough to explain what's needed to re-assemble it.
That center disk, with the three slots in it's perimeter acts as part of the hinge upon which the shoes swing, like a door. (They also locate the shoes, because the shoes are designed with two layers that slip on each side of that disk. Keeps them from coming out, and leaving the machine!)
The hole on one end of the shoe acts as another part of the hinge, and that pin you have floating around is the missing hinge pin... just like a door in your house. Doesn't make too much difference that it's only attached on one side of the shoe, but of course we wish it were both, because that would be a better design. It must be a roll pin, if it is not fitting quite right. It compresses when installed to hold itself in position.
Crude, yet effective.
I'm sry I have not learned how to modify pics with lines and arrows with directions to what goes where... I should work on that!
If you were to insert that pin in the shoe that is without one, (drive it in with a small hammer if necessary), all three should slip onto that center disk and the assembly could be slipped onto the crank, protruding within the case.
It may be necessary to dress the edges of the three slots on the perimeter of the disk with a file to make everything fit smoothly.
It's a really simple, crude design, and should work well enough for the intended purpose. It's just not a real clean, smooth operating design, but is good value for what it is.
Porkchop seems to have more direct experience on the actual product, and even one on his workbench! Maybe he can give further instruction or tell you which part of mine is possibly goofing things up! LoL
Best
rc