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In the CAV 3U1 contact-breaker assembly, the fixed point is live and
mounted on a block insulated from the back-plate. The moving point is
earthed and mounted on the end of a spring blade. The points are opened
by the U-shaped cam forcing a roller to wedge between the blade of the
moving point and the fixed-point mounting-block. The example shown is
a clockwise magneto (as viewed at the drive-shaft end). |
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A close-up.
No doubt identical contact-breaker assemblies are used in other
models of CAV magneto.
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The contact breaker assembly disassembled. The Universal EasyCap will
replace the insulating wafer second from the right. |
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The layout for the Universal EasyCap (on the underside).
Click on the picture for a pdf scale-drawing that you
can print out.
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The EasyCap cut and drilled to size. There is no need to chamfer the
holes because the screws that go through them have insulating sleeves. |
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Ready to reassemble. |
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Assembled and fitted. |
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The example shown is for a clockwise rotating magneto
(as viewed at the drive-shaft end). For anti-clockwise magnetos, a
mirror image of the example EasyCap will need to be made. |
Brightspark Magnetos