Ignition Switch

[Ike <Isaac@avana.net>]

I recently acquired a 71 Spit 1300.
I got an ignition switch off a 72 that i bought for parts.
When you switch from "ON" (II) to "START" (III) the key does not return
to the "ON" position, but rather keeps running the starter, and when the
car fires, you have to turn it back manually.  This can't be how it was
designed! Does anyone know if this is repairable? Can the switch be
dissassembled?  I would be greatful for any help.