How do you remove a freewheel when the tool does not work?

[ichitan]

I have these Chinese freewheels. On the inside are ridges which are supposed to be there so you can use the tool to remove it. With these freewheels, the ridges are very low. I have a tool, also made in China, and the ridges on the tool are also very low. So when trying to use the tool to remove the freewheel, it does not grip properly, and it can't be used to remove the freewheel. The metal on the tool is also very soft, so when it slips, the tool is destroyed.

Does anyone have any good ideas on how to remove a freewheel when the tool does not work?

Somebody is going to say, buy different freewheels, and a better tool. Even if I did, I have these on two bikes already, and at some time in the future, they will need to be removed.