If you chop it it will release the tension in the allen bolt. The expander wedge will still be stuck, but you can then hopefully loosen it by putting a drift on the freshly cut edge of the stem bolt and smacking the shit out of it with a hammer. Then (hopefully) the rest of the stem will pull out.
If you chop it it will release the tension in the allen bolt. The expander wedge will still be stuck, but you can then hopefully loosen it by putting a drift on the freshly cut edge of the stem bolt and smacking the shit out of it with a hammer. Then (hopefully) the rest of the stem will pull out.