Cosmo, I tied your saw-saw (hillbilly phraseology) method and I like it, even though I can shake it by hand for 60 seconds faster than digging out the saw and rigging it up.
I always feel ridiculous shaking the can manually, and with the saw-saw method I don't have to listen to the annoying rattle either.
My POS father-law used to work at factory which made metal office furniture and they used rattle cans for touch up. They layed the cans on a conveyer belt on the production line in such a way that they stayed put and spun.
Carl
