This simple tool requires a black-iron T-fitting and a square-head brass plug. Learn how to make your own plane-adjustment hammer, here.
Wood Plane - FineWoodworking
Calaméo - Fine Woodworking - 233 - Preview
Latest workshop addition: a handmade router plane in walnut and red oak. Doesn't have the weight (or price tag) of a Stanley 71 but a fun build and cuts great : r/handtools
Chisel Hammer, Tool Guide
Make a Plane Adjusting Hammer – Lost Art Press
Make a Plane Adjusting Hammer – Lost Art Press
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Plane Adjusting Hammer