So far I've just been using the heat treating setup from the Bowyer's Bible Vol 4, you can read the chapter on heat treating on google books for free, it gives a nice setup for heat treating and reflexing without a caul. However, its very hard to get even reflex using this method, on the two bow's I've used this on, much of the reflex was induced in the mid-outer limbs. A caul is much more predictable, but you do need a heat gun to use it, unless someone has figured out how to use a caul with a hot plate