I don't have a II either, but I have a I. Early, pre-WWII version. The takeup spool has just a tiny slot to attach the film. The slot is narrower than the narrow part on the leader of modern films, so I have to trim it to fit. There's also a lot of old, dried tape residue on the spool, so I think a lot of people have just taped the film onto it!
Nikon S2, S3, F, F2, F3, FM2, FA, N90S, D80, D7000, D750, Sony a6000, Canon IIf, Leica CL, Tower type 3, Zorki 4, Vito B, Perkeo II, Rollei 35....