Well if they're broken, you're not going to break them by trying to fix them are you? Have a look at a good one and see how close the reed is to the reed plate. If the broken ones have the reed bent, you need to try to bend to the position of the good one. If they're just gunked up, get the pin out.

Most gob-iron players will know when an instrument isn't worth fixing any more. I've plenty of old Hohner Super Vampers from the Sixties and Seventies that aren't really going to get played again.