Quote Originally Posted by Vernal View Post
I wimped out and took the trigger block out with a couple of cable ties round it so that the safety slide and spring were kept in place. The spring looks straight as far as i can see, but it looks as though a length of suitable diameter rod with the ends tidied up could be dropped into the spring without further dismantling - would that make a useful guide?
That is exactly the sort of thing; a tiny length of brass rod should do the trick.

Be careful putting the back block retaining bolt back in, it is VERY easy to misalign it slightly and cross-thread it - a hard steel bolt going into a softish alloy block wasn't one of FWB's best ideas...

According to popular myth, the mainspring can be replaced with one from a 77 if you have one kicking about.