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There are some techniques to make leading of small circles easier, more
accurate and circular.

Use oval or round came to reduce the kinking of the leaves of the came.
As there is less material at the edges of the leaves of oval came, there is
less kinking than on flat came, where the thickness of the leaves is constant.

Estimate the length of lead came required by rolling the circle along the
heart of the came, and cut the came off a little long. Begin to wrap the
came round the circle, making sure the beginning is properly tucked against the glass. Continue to wrap the remainder around until it meets the beginning.

Open the came from the circle and cut the end of the beginning of the came at about a 45 degree angle. Fold it back against the glass. Estimate where the end of the came needs to be cut to meet the beginning.

Cut it at the same 45 degree angle as the beginning. Move the two ends together. If the edges displace each other upwards and downwards, you still have too much came. So just open and trim a little more off. Try again until the angled edges meet without much movement up and down.

This provides a neat, round circle of lead around the glass. Align the cut to butt against a joint or passing came to ready it for soldering.

This technique can also be used on ovals.

 

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