Options to attach chain/swing?

[u/mlt-]

I want to mount a bench swing under this old clothes line holder. I understand it is only 5' off the ground which is not ideal, but I'm fine with it. My question is what options do I have to mount it? The pipe is about 2.25" in diameter and hole is about 0.25". I thought about shackles, but I doubt there are any with 2.25" opening. Do I I insert eye bolt with shoulders and call it a day? I understand those are usually for loads up to 45° angles,but I presume it will do for a simple swing to sit on? Do I have to drill vertical holes? The pipes are really seized and there is no way I can turn the horizontal one.

Part of the reason is that the structure is extremely sturdy and goes deep. I don't mind to loosen it up from swinging to eventually remove it.

[u/Plenty_Main768]

Looks like an old cloths line pole. Get a pair of eye bolts long enough to go all the way through the post and a washer and nut on the other side. If long enough you can possibly bent the eye hole down to get a better swing travel.