I bought one just the other day actually. I went to a hardware store, which sells all sorts of drills, tool sets, bolts etc. There's a fairly common and also cheap slide hammer which cost about £20. What you will then need to do is, use the tools that come with the hammer thus to fit an 8mm MA bolt to the end of it. The hammer won't come with any bolts, but it will come which devices that allow you scew things to the end of it. You will be able to get 8mm MA bolts in the same hardware store. If you still don't have any joy by the end of the day, I'll take a pic of mine for you, so it gives you an idea of how it all works.