Terry, did the frame close up as you were cutting??
Gotta be a bit skeery with thin discs.. 
No mate, not at all, there was no weight on the parts that I was chopping off, so no "blade grabbing, all the weight was supported by the frame section I left.
I might even turn that lower frame part into a test stand as I need to rebuild my GS1000S "Wes Cooley Replica" engine soon with an 1100 kit and some big cams I've got in a box. Cheers, Terry.