What you need to do is start 'at the beginning' as far as getting on.
Go up to your mounting block, stop him, step up onto the block, step off, pat him and walk off. Repeat a few times.
Then go up to mounting block stop him, step up onto it, put foot in stirrup, step off, praise him, and walk off. Repeat a few times.
Then build up to walking up to mounting block, getting up on it, putting foot in stirrup, lifting yourself halfway on, getting down, praise. Repeat several times.
What you are doing is slowly building up to getting on him...and teaching him to stand stock still through the whole process...by doing it in tiny increments you are reducing any tension that he may be feeling. In doing it in small sections, you are also not helping him 'anticipate' when you are getting on, either...he will have to learn to wait for his rider. For a horse who has learned how to bolt, you may always have to incorporate some kind of exercise such as the above, to remind him to stay still, and not anticipate.
You can also put him to work, by keeping a halter and lead on him; but considering you said he bolts as soon as your butt hits the saddle, the longing tactic won't be as effective, I don't think, because this is generally used on horses who fidgit from the beginning.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 07-09-2009 at 10:41 PM.