The adjustable plate is moved by loosening
the two screws on either side of the threaded pin and moving
the “mouth” to the desired position. The plate could be
adjusted to provide an incredibly fine mouth, and thus
improve the ability to take fine shavings, as a smoothing or
miter plane would do.
The third feature which was an improvement of
the No. 1399P was the adjustable fences. My example of this tool
is missing one of the fences, but when originally sold, it came
with two. The fences allow for the router to be used in a
straight line at a pre-set and precise distance from the edge of
The cutting irons on the 2500P are secured
similarly to other router planes. A knurled adjusting nut fits
into one of two slots milled into the back side of the cutter.
Depending on the depth of work, the cutter has a large range of
adjustability by using either of the two slots.
The nut adjusts up and down on a threaded post
attached to the casting to adjust the depth of the cutter. A
cast securing ring holds the cutter firmly in place with a screw
tightened on the opposite side of whichever post the cutter is
Another feature that was first included on the
1399P and carried over to the 2500P was the multiple attachment
points for the cutter. The primary position, as shown in the
photo above, would have been in the center of the plane with the
cutter facing inwards. In fact, this is the only position in
which the adjustable front and pin would be useful in forming a
mouth in front of the cutter.
From this same position, the
cutter could be moved 180 degrees to face the outside of the
plane, thus creating an “open-mouthed” router plane, and perhaps
allowing the cutter to reach areas not attainable when the
cutter is facing inwards.
Also, the fine beech handles on this plane could
easily be removed by unscrewing them, as they have threaded
brass inserts. The cutter assembly can then be moved to either
of the two outside handle positions, creating a narrower tool
with even more reach. The cutter could be mounted to either the
inside or outside of these handle positions, creating six
different possible cutter positions. The fences become obsolete
in either of these outside cutting positions.
Showing the plane set up with the cutter
assembly moved to the left side,
and the left handle moved to the center.