Originally Posted by
dabac
That's not a cassette, that's a freewheel. Since it's just a 2-prong one you can pull the axle and try to use pretty much whatever(like a file) as a tool bit. But if you haven't got a freewheel puller you probably haven't got cone wrenches either, which puts you back at square one. freewheels are notorious for sometimes being fiendisly tight, so improvised tools are just asking for failure. Do it right, get the tool.
OR get the lbs to do it for you, it's a quickie.
+1
Suntour 2-prong freewheels can be difficult to remove at times, even with the correct tool. If you haven't done it a couple times with the correct tool, improvising tools is just asking for problems.