Adjustment system for a coil device

An adjustment system for a coil device, comprising:

• an outside magnetic substance;
• an inside magnetic substance arranged within said outside magnetic substance so as to form gaps between said inside magnetic substance and said outside magnetic substance;
• a bobbin mounted on said inside magnetic substance, said bobbin having flanges;
• a coil mounted on said bobbin;
• first and second openings in said outside magnetic substance, said openings being aligned with said gaps;
• third and fourth openings in said outside magnetic substance, said third and fourth openings being adjacent to said first and second openings and being aligned with said flanges of said bobbin;
• and
• an elongate adjustment tool having a cross section sufficient to permit it to pass through either of said first and second openings in order to make contact with said inside magnetic substance in order to adjust the size of said gaps, and permitting it to pass through either of said third and fourth openings in order to make contact with said bobbin, whereby the position of said bobbin may be adjusted to adjust the inductance of said coil device.