Clothes line soil spike

[TubbyRutter]

So I have been gifted a lovely rotary clothes airer for the garden along with a spike to mount it in.

My house is a new build on the site of an old printworks, the lawn is fine however it appears that there is around 4 inches of soil above a fairly solid layer of rubble and hardcore.

I have tried whacking the spike into the ground with a mallet however this was clearly not man enough, so I then used a hefty sledge hammer and the full force of me (6 foot 5 and think arnie in his prime and you are about there!) crashing down and I still can't get it any deeper!

Any suggestions? guess I need a drill or some kind of specialist tools so let me know!

[TubbyRutter]

Probably should add without destroying too much of my putting green standard (read yellow and moss riden) lawn.