Zero Buoyancy  
 
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Figure “A” is the exact same lure body design as that on page 2; with a couple of simple changes: 
(1). The lure body torso is made of a dense, balsa wood like, urethane polymer foam. INDUSTRIAL POLYMERS Inc. (Poly Wood). 
(2). The belly of the lure body accepts added ballest cavities.  
 
Figure “B” shows how the lure will rest in water; not floating on the surface; yet not sinking. With a few retrieve cranks on the reel, or a rod tip swoosh (pull); you can cause the lure to dive. When forward motion is stopped; the lure will sit still in suspension. You can let it sit there all day. It will not return to the surface. If you choose; you can adjust the ballast to allow the lure to rise or sink slowly. 
 
Figure “C” shows a one-piece, laser cut, .030 ga. spring steel, line & hookset harness. Figure “C”& “D” also show how the line & hookset harness plate can be designed to accept the insertion of a single bead, glass ticker prior to lure body material injection, or casting. 
 
Figures “C” & “E” demonstrate the location of ballast adjustment cavities, in the lure body, that can be cast in with the addition of a mold tool boot, or cut after the body is cast. 
 
TUNGSTEN HEAVY POWDERS Inc. Manufactures and provides one of the most amazing of all lure making elements. Their heavier than led, tungsten powder blended with ordinary “Plumber’s Putty” can be easily inserted into the lure ballast cavities. The amount of THP added to PP will end up being your own formula.
The amount or THP & PP added to a lure body design to achieve true zero buoyancy depends on the size and configuration of the lure design. 
 
Once you arrive at your own formula; specific to your lure design; it will become a simple matter of casting in the correct amount of ballast into each lure to produce the same result with each lure made.