Originally Posted by \./
Don't have a welder, what about drilling a hole through it, putting a large rod through that hole then banging it with a hammer?
That will work too. Don't drill too big or you might rip the tube in half. do it as high on the post as possible so you can get a really good swing. Use penetrating oil and even a bit of heat if needed, but a good hammer should do it.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.