Locking Bolt issues

[Elapid]

Originally Posted by DonVoigt

You know a picture or two would help.

Without any basis, I'll say the spring it too big, or the groove it fits in is peened slightly and won't let it seat.

If a tap with a soft punch won't seat it, work on the above.

It's awfully small to try and get a clear picture. What diameter is the hole? I might try reaming it out if I know I'm using the same size bit. I would do this all by hand, don't want to put a drill on it.