I'm trying to open the freewheel from an old bike that I have, but I can't find how. I even searched for tutorials on the Internet but I can't find one that looks like mine (please see picture).
And I have an old tool that looks like a fit tool (see picture below), but the inner diameter is smaller than the outer diameter of that central part of the freewheel, therefore I can't put it in.
I also found this tool (see picture below) like it would fit in there but I don't have it yet.
Can anyone help with this? Which tool do I need for this and, more Important, is it possible to open it with a hammer and a screwdriver? And if so, which part should I try to open, the middle black cylinder or the yellow toothed one?