This build will work equally well for a Fixie cycle if you do,not have access to a welder.
Step 1: Factors
I do not have access to a welder (except for paying for the job to be done - living on benefits kinda discourages this), so I wanted a mega strong way of locking up the sprocket for my uni.
I had heard about JB weld but although strong I was not confident with it's impact properties i,e when trying to balance there could be high thrust into the JB that could cause it to break down over a short time - but! it might be a good retainer and re-enforcing addition.