Make Your Own Plane-Adjustment Hammer - FineWoodworking

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.

Plane-ability - Paul Sellers' Blog

Making a Plane Adjusting Brass Mallet

Making a Plane Setting Hammer

Plane Adjusting Hammer

Calaméo - Fine Woodworking #226 Preview

Rich's Woodcraft: This is not just any plane hammer

Adjusting Wooden-bodied Planes

Chester Toolworks - Hand Plane Adjustment Hammers - Handplane Central

Holtey Classic Handplanes - Setting hammer.

An Unusual Retirement

Calaméo - Fine Woodworking #287 - Preview

Plane-ability - Paul Sellers' Blog