Hello Franc,
I have shown the new picture to my gunsmith and he is now of the opinion it is in connection with the safety rod, which has been suggested here earlier.This eliminates the drilled in error theory. Either the pin is broken or has slipped out ( another "slip"). It should be a relatively straight forward job to repair or replace (his words, not mine). I am awaiting delivery of the gun.Thanks for the interest.

cheers,

MRwmartin

NA