Fred don't use a hammer claw you will risk damaging the finish.
take the bolt and a spare bush if you have one to a hardware store and get a same size and thread bolt to fit the bush.
Then if you destroy the top of the hardware store bolt no loss. Get some of the adjustable claw plier/clamp and gently pull on the bolt and pull side to side. Once the bush starts moving you should be able to pull out the bush. Have the pliers nice and tight on the bolt head or under the head