Originally Posted by
Fluless
Hi,
I got this MTB and I want to change the cassette. However I cant find the name or the tool to open the sprocket lock ring. The normal Shimano tool doesnt fit. Anyone seen something like this?

As others pointed out, you have a freewheel, not a cassette. A normal Shimano freewheel tool (and a big wrench or bench vise) will remove it.
Consult the guru:
http://www.sheldonbrown.com/freewheels.html
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