Two of the most frustrating mechanical issues to me are stripped bolts and frozen parts. I have bloodied many a knuckle and strained many a finger by working on part that suffered from one of these two ills. Reader Michael had frozen bike seat post and came up with a great solution. All italic text and pictures are credited to Michael:
Recently had a need to adjust the seat height on a bike and discovered that the post was seized good. Tried all the usual tricks -- penetrating oil, vice, etc. Even tried the last ditch vertical hack saw trick -- nothing working.
In the end, I left the old post in but cut it down to the frame. I went out, bought some scrap tubing ($5) with the same diameter as an old bike stem, cut it at the same angle as the wedge and used the long bolt from the stem to loosely connect the two.