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Most of us old sheetmetal guys have a few steamboats in our tool box. A
drill bushing mounted into a 3/4" to 1" slab of aluminum is called a
steamboat because that's what it looks like. Remember 'Steamboat Willie'?
A wooden block sounds ok, too. At "the factory" we always had pleanty of
aluminum plate scraps floating around and the tools to insert a drill
bushing into a small piece of that scrap in the shape of a small rectangle.
Steamboats are used by all sheetmetal men just to make sure the eye is
right.
A number thirty, twenty-one and ten are very usefull. HiLocks require 1/64"
over sizes thru five sixteenths inch or so, depending on how big your bomber
is. Home builders simply need to make a hole normal to the surface and can
let it out to size.
Walter Dodson
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