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> On Oct 28, 2014, at 9:08 PM, John Ruth  wrote:
> 
> Jim,
> 
> The long 11 and 13 bits are used to bore for 3/4 and 7/8 "drifts" in a
shipyard. They are the metallic equivalent of wooden treenails (pronounced
"trunnels")
> 
> Drifts are metal rods used to edge-join major timbers of a wooden ship, such
as when a keel must be built up of many smaller timbers.  A pilot hole is bored
and then the steel drift is sledgehammered in. The drift can be either bronze
(old ships), wrought iron, or steel.

And drilling straight when you can't drill in from both sides is a lesson in
"slow & careful".

Bill, who did this once piecing together a
rudder.------------------------------------------------------------------------