boil the tips...
no more than 5/8 thick...
like Pat says, use a band or metal strap clamped at the form and the limb, while bending so it will keep pressure on the belly side as not to raise splinters.
some people have success with heat guns... and i know how to use one... but, i recommend taking the sure safe route of boiling... btw... steaming never seems to get them soft enough to keep from raising a splinter or tearing the wood internally when doing static tips.use no less than a 1" radius on your form to bend around, and i would recommend 1.5" if it is your first try at static tips.
one tip i suggest is to make sure that the area to be bent is flat, with no irregularity to the surface of the belly side... and also, make sure that the thickness is the same on both sides of the limb throughout the area that will be bent. if you don't, it will resist more on one side and the tip will twist to the left or right when bending.
if by chance it does twist a little... and most times there is just a little... you can grease it with crisco and use a heat gun to heat the limb just below the static curve and twist it back into alignment.
sometimes i would keep with me cold water or even ice to put on it for a faster cooling after the adjustments are done, and it allows you to hold it in place by hand while icing it with the other. when it is cool to room temperature it will stay in place.
~Russell