Sorry Sixds, any answer I could give would be a WAG. What I would suggest would be to get some good pics of the crack and e-mail them to someone that repairs cylinders like US Chrome. They would have the experience to give you an accurate assessment of your options.
I don't know of any north of the border. Even if I did, it's very unlikely that you would get it back in time for the weekend. I just sent mine to US Chrome and was told they were currently running at about a 2 week turn around.
Hmmm I'll try to do some searching, I know there is a company in Manitoba that does it but can't recall the name offhand. When we needed ours done it was recommended we send it to US chrome as the mechaninc that was giving us some support had had some bad luck with the local companies work.