Honestly the chains and sprockets are past their use by date thus you cutter chain will continue to fly off more and more. You will have to replace the cutter sprocket and the transfer shaft sprocket along with the chain.
I'll have a closer look at the photos and give some more info when I get back home.
Cheers, BB
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.