A good deal of care and preparation is required and even then things don't go to plan. I had about 2 1/2" of bend to take out, but I didn't want to go mad and overdo it as the other end has a slight deflex and I wanted it to match.
After half an hour of steam I could push the tip across with hand pressure, so I clamped it across and left it for another half hour (the steamer will run for about an hour before running out of water and switching itself off). I went back later to find the steam hose had come out and was lying on the floor.
Taking the clamp off, I could see I'd taken out about 1 1/2" of bend... not quite enough. So, having got it all set up it wasn't much trouble to put in some extra packing pieces to adjust it so that it could be clamped up with another inch of deflection. I gave it the full hour, and you can see the result in the final pic (the end that had the bend is at the top of the pic).
The whole episode is fairly typical of heat bending, it often takes a couple of goes, and it doesn't hurt to ease the bend in rather than trying to force a big correction in one go.
I've taken an inch off the knottiest end and filed in some nock grooves for a long string. I put it on the tiller and heaved it back to 80#. It looks pretty good, it's certainly flexing. Some people wonder why I heave it to full target draw weigh straight away.There's a full (but possibly boring) explanation here:-
http://bowyersdiary.blogspot.co.uk/2013/12/yew-stick-bow-and-draw-weight-to-brace.html
BTW:-
In the pic at the top of the page, you will see a round wooden disc on the floor to the left of the bench.
That's a "tuit"...
As I said,...
I'd do the bending when I got "a round to it"
(groan... sorry... having seen it in the pic I coudn't resist)

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