I've been at the Midwest Fly Fishing Expo so I've missed all the hoopla about the insert bore.

You received good advice and I'm impressed! I'd probably hit it with the rat tail file too.

Thinking about this, I just wanted to warn folks to be careful if they attempt to hand drill these bores to a large diameter. These hard woods break easily. If you need to drill it, results will be better with a drill press, rather than a hand drill.

Ron