Quote of the year from @MB about @MB!
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Mark, if you're going to put a 2nd piece of angle iron down inside that extension piece, it might be worth cutting a 5-6mm slot on other side so you can weld it to the hub as well.
Your front pulley looks like a taper with a left hand thread nut. Clean both tapers and give it a tap when it's back on and tighten the nut. Do you have the nut? If not it should be relatively easy to find one at a specialist bolt or tool store.
The only thing I got out of all that is that MB has been sniffing something. ?????????????
just clean up the shaft and pulley 680 locktite I did this years ago still going think its a left hand thread so mine has no nut still goes
Just give both surfaces a clean and a rub with scotchbrite or something like an 800 grit. Then clean. Then place the pull on and give it a couple taps with a rubber mallet. If you have an oversize deep socket plate it over the shaft and hit the pulley on using the socket as a 360d press. I'd be very surprised 8f you couldn't get that left hand thread Nut from an All tools or Sydney tools to be honest mate. Maybe not a shelf item but they'd be able to get it in for you. Go in and flip the lid on one of the floor stock drill presses on display. Evolution has not really arrived yet mate. They will likely be the same.