Build an "old woman's tooth" or "tooth router", the predecessor to the hand router.
CANADIAN WORKSHOP Apr 1988 (v.11#7) pg. 25
Build your own hand routing plane. The cutting irons are made from offset screwdrivers.
FINE WOODWORKING #6 Spring 1977 pg. 8
Added Info FINE WOODWORKING #7 Summer 1977 pg. 6
Miniature hand router is make from clear plastic. This allows you to see the groove being cut. Blades are made from Allen wrenches.
POPULAR MECHANICS Jan 1981 (v.155#1) pg. 121
Hand router plane made mostly of wood is used to clean out a dado groove. A sharpened flat head screw does the cutting.
POPULAR WOODWORKING #63 Nov 1991 (v.11#3) pg. 8
Hand routers. Advice on the selection and use of router-planes and spokeshave-routers.
WOODWORK #19 Jan-Feb 1993 pg. 54
Patent-style drawings illustrate the hand stringing and molding router by Preston (circa 1888). This device was used to cut narrow grooves for inlaying and is also suitable for rebating and molding the edges of circular moldings.
WOODWORKER #1010 Jan 1978 (v.82) pg. 23
Make your own hand-router (plane) with a 1/4" wide blade. Use it to clean up the ground on low relief carvings.
WOODWORKER #1019 Oct 1978 (v.82) pg. 461
How to convert a modern metal hand router plane so that it has a long wooden bed (sole) for better control and less damage to the piece being worked.
WOODWORKER #1021 Dec 1978 (v.82) pg. 564
How to fabricate, sharpen and use hand routers.
WOODWORKER #1105 Dec 1985 (v.89) pg. 941
Tip: The sharpened head of a flat-head screw can be used as the blade in a hand router to plane the bottom of a groove or mortise.
WOODWORKER'S JOURNAL May-Jun 1977 (v.1#3) pg. 5
Easily-built hand-operated router plane for cleaning up the bottoms of dados. Built of wood, it uses the sharpened head of a bolt to plane the bottom of the dado.
WOODWORKER'S JOURNAL Nov-Dec 1979 (v.3#6) pg. 5
Make an antique hand router plane, also called an "old woman's tooth".
WORKBENCH Jul-Aug 1980 (v.36#4) pg. 7