The ball in the hex trick works fine with recessed stem bolts, not so well if the bolt protrudes where you can grab the OD.
However, DO NOT USE ANY ADHESIVE. Even if melted or softened, there will still be some tackiness which will make the ball harder to remove.
Instead, melt wax into the hex to keep the ball home. To remove, invert the bike and melt the wax with a cigarette lighter or heat gun, and the ball will fall out.
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