Duplicating forend

[wildrover77]

That would be perfect, but need to know about the flex issue

[knewmans]

These people could probably answer your question http://www.advantage-drillbits.com/auger.html

Maybe try a boat builder who needs to bore straight holes for prop shafts

[wildrover77]

After much research have discovered there is too much flex in normal drills, especially on a wood lathe.

You need to use a gun drill with compressed air rather than fluid.

This is the only way to get a long hole anywhere near straight and true through wood