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The sketch in Fig. 1 shows how to mount commercial air wound coils, such as the Miniductor and Air-Dux types. The mount uses rubber faucet washers on aluminum brackets. For vertical mounting, any old radio or TV tuning knob slightly larger in o.d. than the inside diameter of the coil is used to support the plastic strips in the coil. These methods of mounting are far superior to the conventional way, which uses the wire coil leads to support the coil.
Fig. 1. Vertical and horizontal mounting of air wound coils. In the horizontal method, the brackets are bent toward each other to put the plastic strips in compression.
Ronald E. Winther, W1GWT.