The model released in 1903 does not have these problems.
When the handle is installed it does not have any gaps in the
spaces described previously.
First, the tenon is machined to precise
diameter. The handle ferrule will fit tightly on this
tenon and surface of the wood will touch the surface of the
tenon. This is a winning combination. I have never
seen 1903 release with cracked handle.
The shape to remember... It is slim and nice design.
It will change in a few years to accommodate different approach
to the handle rod - it will be separate machined screw,
installed in larger housing with an inside thread.
Drive-train Assembly
These parts drive the drill.