Hi there, I have just bought Kity 613 from the lovely Ebay, and I am experiencing the same issue as you, It arrived to me very badly setup,( I think the previous owner didn't have the manual), so the blade was in the centre of the wheel, the guides were all worn, etc. I setup it all up correctly, made new huides, fitted a 1/4" blade and it was running sweet for a bit, but I inadvertently hit a nail I hadn't noticed in a piece of old stock, which threw the blade of off the wheel, and now I just can't get it to stay on the wheel, as soon as I get near tension, it throws it off. How did you remedy this on yours?
Many thanks Kris