DO NOT put the nut on the end of the bolt to whack it with a hammer!! I did that and it ruined the bolt and the threads on the nut!!
You can just bang on the actual bolt with a hammer. Since there is a chamfer at the end of the bolt, banging it with a hammer or mallet won't mess up the threads. I learned this the hard way!! Once it starts moving, it should be all good.
I took one of my blasters entirely apart last year. Thought I needed new swinger bearings, but it turned out that they were just dry and needed to be greased up.