both methods work, some do it either way. heat guns tho, you goot watch out it doesnt blister on ya, the boil method, ya gotta strip the innards out before you attempt it. if it were me, i would try the gun method, but watch carefully as you do it, and remember you have to hold it in the position you want till it cools off or it will just return to where it was. and wear gloves, plastic will be too hot to touch.