I am only adding to this thread my friend as I was once in a shop moons ago - same problem ( as yours ) , the bolt needed removing - think the gunsmith said it had snapped clean orf ! It was a job and half so it sat for ages .
I'd just get stuck in . No expert mind so ignore me . I have tried to fix something and although I am now never ever going to try again , don't ask , it was easy to strip down . I got piles of plastic throwaway food trays and heaped everything taken off the action in each , in series . left to right front to back .
And took photos along the way .
Digital cameras are ace !