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A 1-1/4" in PVC Service Entrance Cap is used for the applicator coil housing. Users should observe common sense: don't stick your fingers into the holes. Do not vacuum lint or debris into the applicator coil. If debris enters the Service Entrance Cap or vacuum cleaner body, both can be disassembled for debris removal.
Shown below, a coil-form is formed from the center conductor of the coaxial cable. Cable can be RG-8 or RG-134, #13 AWG. Before the coil is wound, this pre-formed loop shall be fitted into the Service Entrance Cap for sizing: some extra space shall be left for addition of Teflon wire. The finished assembly should fit snugly into the Service Entrance Cap. The Service Entrance Cap comes with all holes blocked. Three ports shall be cleared as shown. All sharp edges shall be sanded smooth, including casting-lines and embossing found inside the cover.
A Shuttle, as shown below, was constructed from thin Polycarbonate plastic. To begin the build, the Teflon wire is attached to the coaxial cable using a crimp-type butt splice. Two layers of heat-shrink tubing are added to cover the splice. The shuttle is then passed through the hole in the center of the coaxial cable repeatedly, to wind the applicator coil. A method is needed to tally turns as they are added. 34 turns of #16 Teflon wire shall be wound onto the coax cable center conductor. Butt splice crimp lugs are notoriously unreliable: stripped wires shall be doubled-over before insertion into oversized butt-splice cups for crimping. Splices shall be tug-tested after crimping.
Wire shall not be pulled taught over adjacent turns. Teflon displays "cold-flow," which is a tendency to get thinner over time. This only happens where the insulation is pulled tightly against a hard edge (which could include other windings). Care should be taken to lay each turn between adjacent turns neatly. Avoid scuffing the insulation wherever possible.
The applicator coil shall lay flat against one face of the Service Entrance Cap. Our objective is to minimize spacing between the coil and neurons to be stimulated.
Shown above: the Service Entrance Cap is pinned to the end of the vacuum cleaner hose by a countersunk screw. This is done so the hose can't be yanked free. This screw is located beneath the cover, after it is installed. Screw length is chosen not to protrude into the interior of the airflow passage. This minimizes cable insulation scuffing. Hose clamps are added to prevent the hose from twisting at both ends. (twisting would shorten the lifespan of the coaxial cable.) As shown below, the hose assembly is pinned to the vacuum cleaner body with a Phillips screw, also to prevent accidental detachment.
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