Even worse cutting down into end grain?

I originally made myself a set of these Deep Undercutting tools for just these problems and found they gave me such an advantage when it came to cleaning up junctions within deep recesses (such as beneath undercut elements, leaves etc) that I asked Ashley Iles to make them generally available.

Here is an introduction to these innovative tools: what they are exactly; what they can do for you; and how to use and sharpen them.