Picture of entire bar please.
Put the bolt in from the back (threaded side) of the stem. Put a penny in the slot. Screw the bolt in so that it presses against the penny. If you continue screwing the bolt in, it will force stem to spread open. Careful though, only go a tiny amount at a time to see if it's loose enough to release the bar. It's easy to destroy the stem by going too far.
Last edited by SquidPuppet; 08-22-17 at 03:09 PM.