What you need to do is put another cog on there, take two chain whips (borrow one at a shop), and un-twist it until it's centered in the spline. Then, force it
I have personally seen that hub blow up under a trials rider. Also, i've heard of many cases of failure to the freehub mechanism with trials riders. I would seriously stay away from those if you value your life. They're time bombs
I'm not the only one! I was doing bad FR/ urban assault on an xc bike before...Then, drop in came along and I just got up and started practicing balance.
I've had very good luck with the SRAM 7X chain. They're not available anymore, but my shop still has a decent stock. It's a bmx chain, but very light and way way stronger than 8/9 speed chains. Also, they're very cheap and look cool (black & gold)
I haven't read any of that, but there are definitely easier ways. I've had fun times with cheap freewheels on bmx bikes when I was wrenching. step 1: put the freewheel in a big vice step 2: crush the said freewheel in the vice, until you see bearings shoot out all over the place and the freewheel becomes oval step 3: unscrew crank/wheel. use a pipe for you crank if you have to. Easy and fun