[Konvas] Also Dan home made developing spool

[Pierre Samuel Rioux]

Ya!  we could see the wave it's only on the edge of the plastic sleave
in the center you have room for the chemical to get in and do the
developing.

How come Dan using some black film to do this ? ( look like a black leader )
why not using a clear film ?

Maybe it's possible to made this  with a heated roule or a wheel how
included the
curve in the edge.