Countersink Inside a tube

[editor@glue-it.com]

I needed to countersink a hole inside the case of a model engine so that I could fit a bracket. The only way I could think of doing it was to make an extension for the countersink with a small drive shaft - by default the countersink head is bigger in diameter than the hole it is countersinking. Even with holes opposite each other this would be a difficult problem to solve.



in action



or nearly in action as I ended up driving it with a small hadnheld electric drill.