3 string guitar pickup bobbin f- style

Sizes: base 65 mm (length) x 22 mm (width) x 18 mm (height);
mounting holes distance 49 mm
bobbin 39 mm (l) x 9 mm (w) x 11 mm (h)
designed for 3 strings e.g. cigar-box-guitar
string distance 11-12 mm,
5 mm iron poles, alnico magnet (e.g. 10x40 mm) has to be glued underneath, or use magnetised iron rods.
there is enough space for app. 4500 turns of copper wire (0.42) resulting in a resistance of app. 4 kOhms, a hot wiring with a screaming fender style sound.
small holes in the base ar