Quote Originally Posted by mopar_guy View Post
The most likely situation is that the lens cells of a Wollensak Raptar will NOT screw directly into a Copal shutter of any size without modifying the shutter.
It isn't just likely that it won't go, it won't go.

Each Rochester manufacturer (Kodak, Wollensak, Ilex) had its own proprietary shutter size standards. None match the Compur/Copal/Prontor/Seiko standard.

Dani, Rapax shutters are at least as good as Compurs. Have the shutter the lens came in overhauled or try to get the seller to take lens and shutter back.