I think ive boaught a bit of a pig in a poke :(

[Peter Laidler]

I would just concentrate on the fact that the body is worn out, as indicated by the fact that the sear binds on the free running of the bolt. What'll eventually happen is that the hard locking lug will chip the cocking bent of the sear and that'll chomp up the face of the cocking piece. Seen plenty of 'em!