Heavy Duty Parasol Base (Randlay TF3)

I've just bought a rotary washing line that needs to be secured into a tube that fixes into the ground using a large spike.

Easier said than done- the ground here is like granite and there's no way the spike is going in!

I asked for advice and some clever bod recommended putting the washing line straight into a Parasol Base.

If anyone has one they don't want or need, please can I have it?

Or does anyone else have any other ideas of how to sort this out without hiring a team of burly (expensive!) hole diggers?

Thank you 🙂