Quote Originally Posted by Tach
I ask for used cassetes at photo labs; they usually come with a short leader (3-5mm) of film sticking out of the velvet.

Instead of attaching the bulk film to the spindle, I just tape (with regular transparent tape) it to the leader sticking out. No need to dissassemble the cassette and/or buy reloadable cassetes.
This is brilliant! I'll have to ask for some the next time I'm at my lab!