What sort of wattage are you after?

RS Components have 50/100/200VA kits that comes with a pre wound 115/230
primary on it, and a piece of paper with tables for calculating a secondary.
The unit is not potted, and so it should not be too hard to either remove
the existing primary, and replace it, or else add a supplementary primary
winding before putting a secondary on it. If you did the latter then make
sure you put sufficient insulation in between the primary and secondary.

The kit has a plastic bobbin with primary windings, and a stack of
laminations to put in afterwards, along with the necessary metal pieces to
clamp it all up afterwards.

At http://rswww.com/ look for catalogue # 182-9919 for 50VA, 182-9925 for
100VA and 182-9931 for 200VA

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