I have two 7N42 movement watches - one is a 7N42-8070 and the other is a V742-6A40.

I have tried replacing the movement in the former a couple of times now, but in both cases the new movement refuses to work.

I can't think I have bought two bad movements (they both came from Cousins) so I am wondering if there is something about these movements that I am missing? Are they particularly vulnerable to ham-fistedness, or is there something I need to do when replacing them? I can't see any "AC Reset" buttons as on some other Seiko movements.

Alternatively, who would people here recommend to undertake the replacement of the movement in both watches?

Having replaced numerous other quartz movements the 7N42 seems to be my bete noire!